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my rolling road results !
#629979
13/06/2008 14:28
13/06/2008 14:28
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kevin20vturbo
Unregistered
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kevin20vturbo
Unregistered
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coupe 20v turbo. standard internals mods. turbo gt28r. gtech 2 chip. apexi boostcontroller. hks airfilter. big intercooler. walbro fuelpump. 3.8 fpr. supersprint exhaust no cat . results: 302hp 415nm 1.3 bar boost. :). greetz kevin.
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Re: my rolling road results !
[Re: ]
#629985
13/06/2008 14:36
13/06/2008 14:36
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MattW
Unregistered
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MattW
Unregistered
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Good results, I'll be going on the RR in a few weeks with an almost identical spec: GT28R standard internals gtech 2 apexi AVCR K&N cone SIP Pro Alloy FMIC Blueflame turbo back decat exhaust Walbro 255 + wire mod Should hopefully be about the same Is a 3.8 FPR necessary? havent got one of those, does yours run lean without do you know?
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Re: my rolling road results !
[Re: Nigel]
#630010
13/06/2008 15:29
13/06/2008 15:29
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kevin20vturbo
Unregistered
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kevin20vturbo
Unregistered
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I have direct wiring to the fuel pump + sip greetz kevin .
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Re: my rolling road results !
[Re: ]
#630072
13/06/2008 19:13
13/06/2008 19:13
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MattW
Unregistered
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MattW
Unregistered
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Wiring to the SIP, what's that for?
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Re: my rolling road results !
[Re: ]
#630083
13/06/2008 19:38
13/06/2008 19:38
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eldinho
Unregistered
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eldinho
Unregistered
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have another read matt good results by the way!
Last edited by eldinho; 13/06/2008 19:42.
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Re: my rolling road results !
[Re: ]
#630093
13/06/2008 20:02
13/06/2008 20:02
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MattW
Unregistered
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MattW
Unregistered
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I knew that...
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Re: my rolling road results !
[Re: ]
#630236
14/06/2008 12:13
14/06/2008 12:13
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eldinho
Unregistered
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eldinho
Unregistered
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thats the problem with the white stylesheet, you can't see smilies! doh!
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Re: my rolling road results !
[Re: ]
#646765
16/07/2008 01:31
16/07/2008 01:31
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kevin20vturbo
Unregistered
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kevin20vturbo
Unregistered
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1.4 bar good safe level of boost ?
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Re: my rolling road results !
[Re: ]
#647202
16/07/2008 19:23
16/07/2008 19:23
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suba
Unregistered
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suba
Unregistered
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The turbo will run that, but any more and it wont be efficient - the issue is the fuelling and advance with 1.4 bar.....it will be fine if the map is spot on, but otherwise you are pushing it on the standard internals IMO.
You may also only notice a small increase in bhp with more boost - there is simply a point where no matter what you do with the boost you wont get anymore (or you'll get 1 bhp for another 0.1 bar of boost) - at this point you want to back the boost down and have a car which is running efficiently.
My car runs the same turbo as yours with a few other mods to help the engine flow and I called it quits at 1.35 bar.
You mention a supersprint exhuast...if that is mid section and back box then you will gain a fair bit from a 3 inch downpipe with a 5 stud arrangement for the turbo, and the gains will be made without having to ram more boost through the engine.
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Re: my rolling road results !
[Re: ]
#850208
15/06/2009 20:21
15/06/2009 20:21
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kevin20vturbo
Unregistered
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kevin20vturbo
Unregistered
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What to do next for 350 hp ?.
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Re: my rolling road results !
[Re: ]
#855550
24/06/2009 12:34
24/06/2009 12:34
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Marco20valveT
Unregistered
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Marco20valveT
Unregistered
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could go to see flea?!?
im sure he can improve on your spec!
good spec by the way!
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Re: my rolling road results !
[Re: ]
#855593
24/06/2009 13:49
24/06/2009 13:49
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suba
Unregistered
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suba
Unregistered
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You will have to go bigger on the turbo - GT28rs 0.86 on your spec, or a GT2871R 0.64.
You'll also need an organic / paddle clutch, and at the very least a 3 inch downpipe.
With a 3.8 bar regulator and standard injectors you are stretching the fueling system to the absolute limit.
In my opinion you MUST get the car mapped properly at this level of power if you want the engine to last. Changing to forged pistons will give you scope to run more boost - say 1.5-1.6 bar+, but you also have to be careful with the standard rods and rod bolts which can give or bend with over 330lbs/ft (from memory I think this is the recognized threshold.)
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Re: my rolling road results !
[Re: ]
#870056
21/07/2009 21:27
21/07/2009 21:27
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Reuven
Unregistered
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Reuven
Unregistered
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I have the same mods like you guys'and I like to ask-is that bhp at the wheels? Mine gave 240 bhp{wheels} on 33 dg heat today
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Re: my rolling road results !
[Re: ]
#870095
21/07/2009 22:23
21/07/2009 22:23
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suba
Unregistered
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suba
Unregistered
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Both those figures will be at the fly...
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Re: my rolling road results !
[Re: Richard24]
#937685
19/11/2009 22:19
19/11/2009 22:19
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kevin20vturbo
Unregistered
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kevin20vturbo
Unregistered
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Hello, which one is better for my mods ?. 1:Water / Methanol Injection Kit 2:Chargecooler kit . greetz kevin.
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Re: my rolling road results !
[Re: ]
#937746
19/11/2009 23:22
19/11/2009 23:22
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Steve_G
Unregistered
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Steve_G
Unregistered
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You say you have a big intercooler, do you have charge temperature issues?
Just wonder why you would be thinking of a charge cooler and/or WI.
Personally not a fan of WI (yes you can get get good results with it) but you fail safe modes etc. IMO i think its a mask. maybe at BIG power you would consider it but at 300-350 i wouldnt. Its another thing to go wrong.
(All my opinion)
cheers Steve
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Re: my rolling road results !
[Re: ]
#937894
20/11/2009 10:58
20/11/2009 10:58
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suba
Unregistered
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suba
Unregistered
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Hello, which one is better for my mods ?. 1:Water / Methanol Injection Kit 2:Chargecooler kit . greetz kevin. Neither - if you have a decent front mounted Intercooler. At just over 300bhp you are on the limit of a GT28R unless you have headwork. So if you want to get more power then you'll need to go bigger on the turbo.
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Re: my rolling road results !
[Re: ]
#938062
20/11/2009 14:31
20/11/2009 14:31
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Joined: Feb 2006
Posts: 5,390 Essex
Trappy
Forum is my life
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Forum is my life
Joined: Feb 2006
Posts: 5,390
Essex
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Hello, which one is better for my mods ?. 1:Water / Methanol Injection Kit 2:Chargecooler kit . greetz kevin. Neither - if you have a decent front mounted Intercooler. At just over 300bhp you are on the limit of a GT28R unless you have headwork. So if you want to get more power then you'll need to go bigger on the turbo. I'd have thought you could push the GT28R a bit further with a bigger bored downpipe/ exhaust system. On a bigger turbo than the 28R, you'd NEED a bigger downpipe to get much more power. My peak went from 292bhp to 312bhp with a straight swap (and remap) from GTiR to GT28RS. I'd advise anyone attempting to push any non standard turbo to near it's limit to go for a bigger downpipe. I say this because both the hybrid and the GT on my car made the same power from 4krpm to 6,200rpm. In my thinking, this means that the standard exhaust bore simply can't flow any more.
F****** b****** thing...
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Re: my rolling road results !
[Re: Trappy]
#938210
20/11/2009 17:11
20/11/2009 17:11
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suba
Unregistered
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suba
Unregistered
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yes - absolutely, but a GT28R is at it's limit a shade over 300bhp on the standard head. It just can't flow any more - even with headwork 340bhp is the absolute max.
having a 4 inch pipe wont get round the flow of the turbo and the head.
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Re: my rolling road results !
[Re: DaveG]
#938249
20/11/2009 18:11
20/11/2009 18:11
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suba
Unregistered
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suba
Unregistered
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Yep - 320 is about the max (a bit over 300).
1.7 bar on a GT28R is more than it should handle - it'll be puffing a lot of hot air, and certainly wont hold that at the redline.
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Re: my rolling road results !
[Re: ]
#951858
15/12/2009 19:48
15/12/2009 19:48
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coupeturbo12
Unregistered
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coupeturbo12
Unregistered
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nice what is 1.5 bar in psi?
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Re: my rolling road results !
[Re: ]
#951866
15/12/2009 20:08
15/12/2009 20:08
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Joined: Dec 2005
Posts: 2,588 Essex
Rog20VT
I need some sleep
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I need some sleep
Joined: Dec 2005
Posts: 2,588
Essex
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Re: my rolling road results !
[Re: ]
#962600
07/01/2010 17:17
07/01/2010 17:17
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Joined: Jan 2006
Posts: 3,034 Sweden
Per
I need some sleep
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I need some sleep
Joined: Jan 2006
Posts: 3,034
Sweden
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yes - absolutely, but a GT28R is at it's limit a shade over 300bhp on the standard head. It just can't flow any more - even with headwork 340bhp is the absolute max.
having a 4 inch pipe wont get round the flow of the turbo and the head. I'm not sure about this, I have 275.2whp at 1.14bar - which is around 320hp on the flywheel. With 1.3bar it's a different beast, I'd say there's another 15hp there. This could be down to many tweaks but I do think my 3" downpipe helps.
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Re: my rolling road results !
[Re: Per]
#963000
08/01/2010 13:08
08/01/2010 13:08
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suba
Unregistered
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suba
Unregistered
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I'd put money on that extra power feeling coming from more mid range torque rather than top end power.
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Re: my rolling road results !
[Re: Per]
#963054
08/01/2010 14:33
08/01/2010 14:33
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suba
Unregistered
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suba
Unregistered
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I just re-read this. Having a 3 inch downpipe will definately help. My original post was concerning how much benefit you would get going to a 4 inch pipe. I dont think you would get much more than on a three inch with a GT28R.
Garrett rate the turbo to flow 320 bhp max - I would suspect that anyone running significantly more than this on the turbo would been down to an artificially high or manipulated rolling road reading.
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Re: my rolling road results !
[Re: ]
#963115
08/01/2010 17:03
08/01/2010 17:03
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Joined: Jan 2006
Posts: 3,034 Sweden
Per
I need some sleep
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I need some sleep
Joined: Jan 2006
Posts: 3,034
Sweden
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Garrett rate the turbo to flow 320 bhp max - I would suspect that anyone running significantly more than this on the turbo would been down to an artificially high or manipulated rolling road reading. Well that's one way of looking at it. (or the turbo is a little tweaked )
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