There is an interesting article in this months Sport Compact Car on their Project EVO. They've done considerable work including Cosworth Head with their big cams. The turbo they are using is the 3076. One of the last paragraphs states that the turbo is quite laggy. The best they could squeeze out at the strip was a 12.8 at 100mph on pump. They spent alot of $$$ for a 12.8.

 

as a few others have said, from personal experience that turbo should not have that much lag, it is probably a combination of things leading to your poor spoolup


a few things to check off the top of my head..........


check for boost leaks

check your Boost controller

what type of exhaust do you have? high flow cat?

as someone else mentioned, check for the wastegate seat

Check the turbo hotside, it is not unusual for RNR to use the largest size, that could be contributing to the lag as well

has it been laggy since the turbo was installed?

are you using the stock airbox?

how long have you been running the aftermarket intake manifold? quite a few possible sources for leaks there as well

i personally am not a fan of RNR's products & am tempted to say that is a large part of the problem right there

 

well then they dont know what the hell they are doing. thats horrible. sounds like its way undertuned or something.

like i said b4 i have the 3037s with the .82 a/r hotside and i have full 21.5psi at 4500rpm

 

A few owners with these GT30 series kits have posted good results.

http://www.vishnutuning.com/evo_Stage2_v500.htm
http://www.vishnutuning.com/evo_Stage3_v550.htm

Nice kits, but a little on the pricey side.

 

yea his name is scorke. i know your not going to talk about the ATP owners here who like there kits. me, smokeinjoe, KOEVO, boostin and others.

 

I don't see ANY reason as to why you would run a GT3076R Vs. a 50TRIM.m 50Trim time and time again kills the 30R turbo. It is a true pump gas turbo. One of my buddies has a Built motor, an AEM EMS, a SBR 3076R kit, a SBR FMIC, and the best he can muster is a 11.8 @ 118MPH. This on a IX of all things. Dave Buschur calls the 3076R a Turd and I am inclined to believe him.


IX Turbo
50TRIM
GT35R (37R for extreme street users)
and now the FP GREEN

These should be your only STREET turbo options, it is that simple. Each and everyone of these turbos has been proven a winner, the 50Trim haveing the most positive results not to mention that the IX spools it SO quick and 450WHP on pump is found easilly on a flash.

 

hehe, we now know that ATP kits can be setup to perform respectably.

We also know about scorke and his ATP sentiments, if he sees this thread ...
well you know.

 

first off 11.8 is fast, but maybe your friend cant drive the car as well as some others can. not sure where the term "turd" comes from when refering to this turbo. when i can mash the gas and get the car sideways in an AWD, thats impressive to me.

and yes we all know how scorke feels about ATP, most here feel that way. its kinda like burned into there brains that ATP kits suck. ah whatever, im more than happy with mine.

 

11.8 is indeed fast, as fast as what a stock turbo can do on pump gas. In fact we have a member running 11.23 on a STOCK VIII Turbo and pump gas. 118MPH is quick, but again, nothing a stock turbo cannot do. I am looking for 120+ Trap speeds on pump gas here.

 

very true but those 11.23 numbers are gutted evos with open downpipes. so im all reality a 11.8 full weight is ****ing fast. i took a guy who is a competitive drag racer for a ride in my car with my set up now and all he said was, easy 11's. now without an actual slip im not saying i can personally run 11's, but i pretty damn sure my car can. again, full weight, pump gas and 21.5 psi. now say i put c16 in it and 30psi, hum now we are talking.

 

Yup sure is. One of my buddies is running 11.8 @118, pump gas, full weight, VIII Turbo on again a Dynoflash. A LOT of Stage one IX's are running low 12's High 11's at 116-118MPH without cams. I believe the bar has been raised a bit and to me 11.8 @ 115-118MPH is PUMP GAS STOCK Turbo territory. The 11.23 Evo isn't exactly gutted but it has been lightened for sure.

If I were to upgrade to a 30R turbo, I would be looking for 120+ trap speeds on pump gas, anyhing less is simply unimpressive to me.

 

I know I'm going to get lit up for this one, but pump gas, stock turbo and running 11's is something I'll have to see with my own eyes before I'll believe it. I've been to the track too many times and seen these so-called 11 second cars not make it down that far. I think it must be like the guy always bragging about the number of women that he had. Testosterone fueled numbers.

 

i'm doing a boost leak test in couple of minutes. But i doubt it's my intake manifold, cause i made plenty of power o the dyno recently.

 

 

It is VERY common in fact as long as the proper mod list has been added and a proper tune. A DYNOFLASH has been mostly responsible for this trap speed. It is up to the driver to get the ET .


Especially on a IX now with the added mid range torque, 15+ for an exhaust and a tune is the Norm