JamieP Posted March 31, 2007 Share Posted March 31, 2007 Just a thought. When on the rd my car holds boost 1.5bar perfect all the way to the rev limit, but when on the dyno in high rpm,s my boost starts dropping off right back to 1.2bar,car made 576bhp yesterday but if my boost would hold up on the dyno id be well over 600 im sure. Going back today to check for possible boost leaks but im sure it dont have any:search: I was thinking this morning could my ic not be man enough and would that effect boost im only running 2 row? It dont really bother me as the car runs perfect on the street its just that high power figure would be nice:D Any other suggestions welcome. Regards Jamie. Quote Link to comment Share on other sites More sharing options...
hadyn Posted March 31, 2007 Share Posted March 31, 2007 Perhaps your boost controller isnt upto the job? Weak actuator?? Quote Link to comment Share on other sites More sharing options...
JamieP Posted March 31, 2007 Author Share Posted March 31, 2007 Perhaps your boost controller isnt upto the job? Weak actuator?? Boost is run by AEM ems and it dont have a actuator;) Quote Link to comment Share on other sites More sharing options...
Pig Posted March 31, 2007 Share Posted March 31, 2007 What RWHP did you get? Could it not be that the IC is man enough on the road but not with those fans blowing on it to keep it cool??? Quote Link to comment Share on other sites More sharing options...
AshBhp Posted March 31, 2007 Share Posted March 31, 2007 Your T88 had no probs with the same inter-cooler? Must be your LITTLE turbo. Quote Link to comment Share on other sites More sharing options...
MrRalphMan Posted March 31, 2007 Share Posted March 31, 2007 If it just fans when on the RR or do they use dry ice as well? Quote Link to comment Share on other sites More sharing options...
AshBhp Posted March 31, 2007 Share Posted March 31, 2007 If it just fans when on the RR or do they use dry ice as well? Just fans Quote Link to comment Share on other sites More sharing options...
Wez Posted March 31, 2007 Share Posted March 31, 2007 Wheel slip or dyno issue as it doesnt sound like the dyno can load it up enough for you to generate the boost. If the car is fine on the road surely its not the car eh. Quote Link to comment Share on other sites More sharing options...
TLicense Posted March 31, 2007 Share Posted March 31, 2007 I was going to say it's one of 2 things. Either your IC is too restrictive, or your turbo isn't man enough. But thinking about it, the 2 are inextricably linked. Your IC will have a pressure drop accross it. Reducing the pressure drop by getting a less restrictive IC, means you'll get more pressure at the manifold. However, whatever IC you have, it will still have a pressure drop, and the pressure being generated by the turbo at the turbo, is always going to be bigger than that at the manifold. Sooo what I'm saying is that it's kinda 6 of one, half a dozen of the other. You COULD say that your IC is too restrictive, OR you COULD say your turbo isn't generating enough flow to cope with the losses in your system. They both amount to the same thing. That said, you seem to be fairly happy with the turbo and the way it spools etc. So I would probably be inclined to change the IC for a less restrictive one than comprimise on turbo size (and inherent spool characteristic) The thing to be careful with is, just increasing the size of your IC may not necessarily make it more efficient. You could have the most efficient 2 row in the world. Swapping it to a poorly designed 3 row may not make it less restrictive or efficient as an IC overall. Plus there's the other downstream consequences to consider (I have cooling in mind). Lastly, or rather first of all, I would get a log of actual on road data. You may not really see the boost tail off, in which case in the real world their isn't really a problem. However, if it's that elusive 600BHP number that your aiming for, then you need either a turbo change or a reduction in losses through the inlet system. Hope that helps! Quote Link to comment Share on other sites More sharing options...
Lucifer Posted March 31, 2007 Share Posted March 31, 2007 Boost is run by AEM ems and it dont have a actuator;) I woudl check Wastegate pressures first, in adn out. Quote Link to comment Share on other sites More sharing options...
Terminator Posted March 31, 2007 Share Posted March 31, 2007 If it goes well on the road, why worry a bout dyno figures. What ever figure you have the car will still be the same on the road. Quote Link to comment Share on other sites More sharing options...
supra matt Posted March 31, 2007 Share Posted March 31, 2007 but he said it runs fine on the road holds 1.5 bar up to the limiter, I would say it's not getting enuff cold air from the fan when its on the rollers as we all no hotter air will drop boost as it's not dence enuff , hence why your car will go like a rocket on and cold or damp day and then be as slugges as old boot's on a hot one , What you need do jamie is take the nos out the boot and spray the cooler with it till it freeze's then do your power run , should be fine then . Quote Link to comment Share on other sites More sharing options...
Terminator Posted March 31, 2007 Share Posted March 31, 2007 If it goes well on the road, why worry about dyno figures. What ever figure you have the car will still be the same on the road. Quote Link to comment Share on other sites More sharing options...
JamieP Posted March 31, 2007 Author Share Posted March 31, 2007 Thanks for the advice, and yes as i said the car boosts perfect on the street, think ill book it onto SRR for a run to see if it does the same there before i start changing stuff. Any other suggestions welcomed. Regards Jamie. Quote Link to comment Share on other sites More sharing options...
Lucifer Posted March 31, 2007 Share Posted March 31, 2007 Where you were dynoed - do they have centrafugal fans? Thats important for airlow, not just air movement. Quote Link to comment Share on other sites More sharing options...
TLicense Posted March 31, 2007 Share Posted March 31, 2007 Another suggestion is, go to a more optimistic dyno. I'm sure a few people on here could recommend a few Quote Link to comment Share on other sites More sharing options...
Lucifer Posted March 31, 2007 Share Posted March 31, 2007 IN anycase, Intake tamps should have been monitored anyway so youll see a drop off in the intercooler. Quote Link to comment Share on other sites More sharing options...
JamieP Posted March 31, 2007 Author Share Posted March 31, 2007 Where you were dynoed - do they have centrafugal fans? Thats important for airlow, not just air movement. I dunno, its a big fan that moves plenty of air, pic of it in my garage. Quote Link to comment Share on other sites More sharing options...
JamieP Posted March 31, 2007 Author Share Posted March 31, 2007 Another suggestion is, go to a more optimistic dyno. I'm sure a few people on here could recommend a few Yea true:D Quote Link to comment Share on other sites More sharing options...
Homer Posted March 31, 2007 Share Posted March 31, 2007 What IC do you have? Quote Link to comment Share on other sites More sharing options...
Lucifer Posted March 31, 2007 Share Posted March 31, 2007 I dunno, its a big fan that moves plenty of air, pic of it in my garage. Size of the fan is irrelevent, Its the force that is teh deciding factor. You coudl have 1 mile wide blades and no foce behind it. Quote Link to comment Share on other sites More sharing options...
Jake Posted March 31, 2007 Share Posted March 31, 2007 Don't you have one of those XS Power intercoolers with the really shallow end tanks Jamie? I'm thinking maybe a better designed one would be the answer. Quote Link to comment Share on other sites More sharing options...
Gamer Posted March 31, 2007 Share Posted March 31, 2007 IMO, the fan at SRR is quite a bit better than the one at the RR Dan uses. It seems to push a helluva lot more air... Enough that the bonnets need to be held or strapped due to the force involved. Quote Link to comment Share on other sites More sharing options...
Lucifer Posted March 31, 2007 Share Posted March 31, 2007 IMO, the fan at SRR is quite a bit better than the one at the RR Dan uses. It seems to push a helluva lot more air... Enough that the bonnets need to be held or strapped due to the force involved. NOW they sound like centrafugal fans alright. One of those with 2 large cfm fans to actually move teh cold air in is what you need. Quote Link to comment Share on other sites More sharing options...
JamieP Posted March 31, 2007 Author Share Posted March 31, 2007 Don't you have one of those XS Power intercoolers with the really shallow end tanks Jamie? I'm thinking maybe a better designed one would be the answer. No, its a greddy i think. Quote Link to comment Share on other sites More sharing options...
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