Less boost = more power?

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Re: Less boost = more power? [Re: Rudidudi] #1162562 27/01/2011 14:02 27/01/2011 14:02
S suba Unregistered
suba Unregistered S	Originally Posted by Rudidudi Originally Posted by suba Put it this way - on the stock turbo I tried upping the boost to 1.4 bar on the dyno, and got no more out of it than at 1.2 bar...... this was through a front mount IC as well. if the restriction was airflow then you would have found that whilst maximum power may not have increased the torque continued to be delivered lower in the rev range. having huge quantities of torque available at low revs is always beneficial. infact id argue that in non race applications torque at low revs is more valuable than high bhp at top end of the revs. its all about what is available under the curve, not the peak figure True - but a brief overboost spike on an FWD car just makes you loose traction most of the time, and you are pushing the turbo past it's efficiency - making it very likely to fail.

Re: Less boost = more power? [Re: ] #1162579 27/01/2011 14:35 27/01/2011 14:35
N Nievelc Unregistered
Nievelc Unregistered N	Is that a regular temp sensor like the water temp sensor? Tim

Re: Less boost = more power? [Re: ] #1162581 27/01/2011 14:46 27/01/2011 14:46
N Nievelc Unregistered
Nievelc Unregistered N	Cannot seem to find a specific gauge that measure charge temps. Probably a waste of time unless it's hooked up to a laptop and logged in conjunction with time and RPM

Re: Less boost = more power? [Re: ] #1162584 27/01/2011 14:57 27/01/2011 14:57
G GS_Racing Unregistered
GS_Racing Unregistered G	no,you will need a charge air temp gauge with a sensor capableof reading temp in the boost pipes without being thrown off by the flow. i have this one fitted in mine (rarely sees over 35 degrees c but then i run twin intercoolers!) http://www.methanol-injection.co.uk/images/tn4_2164447.jpg but there are also other gauges http://cgi.ebay.co.uk/Air-Charge-Te...M&hash=item4cf4309f70#ht_2640wt_1139 http://cgi.ebay.co.uk/PLX-DM5-Air-I...M&hash=item1c15ae6963#ht_4126wt_1241

Re: Less boost = more power? [Re: ] #1162661 27/01/2011 18:03 27/01/2011 18:03
T tricky Unregistered
tricky Unregistered T	Do you have any pictures of your I/C setup ? Last edited by tricky; 27/01/2011 18:04.

Re: Less boost = more power? [Re: ] #1162694 27/01/2011 19:00 27/01/2011 19:00
G GS_Racing Unregistered
GS_Racing Unregistered G	no,but its fairly easy to describe,front mount alloy intercooler behind the bumper then another intercooler running vertically (from front view,its about 30 degrees from vertical from the side as its leaning toward the rear of the car to get the pipe work to the throttlebody) in front of the wheel arch on the passenger side,same kind of routing as a normal front mount i think,but i saw enough space to fit a second cooler,and went for it,that 35 degree reading was on a hot day,1.5 bar,WOT through 3rd,4th and into 5th gear.very effective. Last edited by GS_Racing; 27/01/2011 19:02.

Re: Less boost = more power? [Re: ] #1162833 27/01/2011 23:56 27/01/2011 23:56
T tricky Unregistered
tricky Unregistered T	Were you not concered about / have you measured pressure loss through them ? Obviously it cools the charge very well, but I was just curious.

Re: Less boost = more power? [Re: ] #1162997 28/01/2011 12:39 28/01/2011 12:39
G GS_Racing Unregistered
GS_Racing Unregistered G	pressure loss is much less important to me than cooling,i did have a quick check,plumbing my boost gauge to either side and saw no problems,the car runs faster with no noticeable change in lag Last edited by GS_Racing; 28/01/2011 12:40. Reason: spelling

Re: Less boost = more power? [Re: ] #1163085 28/01/2011 14:57 28/01/2011 14:57
A ally_f Unregistered
ally_f Unregistered A	[quote=MattW I'm using a simple ball and spring PRV, no placebo effect here, I measured it on the boost gauge. [/quote] I had the same issue with boost peaking and dropping off very quickly with the original (faulty) controller and a PRV; swapped it for a Gizzmo electronic controller and now it holds the boost much much longer. On the rollers at Weston Performance it took it from 219BHP (with Gtec1, so not good) up to 250.

Re: Less boost = more power? [Re: ] #1163143 28/01/2011 16:43 28/01/2011 16:43
N Nievelc Unregistered
Nievelc Unregistered N	GS - Your setup is quite interesting makes me think is there a benefit to having 2 smaller intercoolers instead of 1 big one? Do you per chance have a RR?

Re: Less boost = more power? [Re: ] #1163167 28/01/2011 17:18 28/01/2011 17:18
G GS_Racing Unregistered
GS_Racing Unregistered G	no,there is one within 5 minutes drive of my house though.my tuning philosophy is usually one of,if i have stuff lying around ill try to use that instead of buying more stuff and wasting money,so i used what i had,tested it,it worked,so it aint broke lol. i have the same setup as this car,and if it works for them itll work for me! http://www.youtube.com/watch?v=jPLbMWxjo7Y 900bhp mk4 golf,at 4.33 you can see the 2 intercoolers as per mine in exactly the same configuration

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