I have been doing a little bit of research on the different spool up characteristics of each turbo kit I am considering for my car. I have read alot of threads about this and it seems there are confliting numbers on some of the kits.

When does boost START, and when is FULL boost reached on the Greddy TT, Turbonetics ST, JWT TT?

Also, are all these turbos water/oil cooled? IIRC I read that the greddy was not water cooled. Which are BB turbos, and which are ceramic?

Thanks

 

Turbonetics 60-1 boost comes on around 2300-2500 full 8 PSI by 3200-3500. It is a ceramic ball bearing unit.. oil cooled only..

 

More toward 3500-3700 on the TN, Id have to see 3200 full boost to believe it....but they all spool very quick, and when shifting at redline, you will always be in full boost in the next gear....JWT TT will be the quickest spooling, then Greddy then TN.

 

I have a video of it somewhere on my car..

 

Eh, Ive seen it, but I can honestly say Ive never seen full boost that low you know it fluctuates its not always the same rpm. I just tell people around 3500 by 4000 rpm's your gone....

 

I have it by 3500, full. I'd say because it's a larger turbo, I've heard my car spool while racing a greddy TT (he ran 11psi), and mine hit full boost faster, though I think his spool started before mine.

Either way.......lag is not noticeable.

 

This is such a bad question because there are so many variables involved. Do a little more research and study each turbos compressor map and you will be able to make an educated choice. Otherwise this thread will turn into a pi*sing match between our resident turbo allegiances.

 

Also wanted to *** I boost 9-10psi so that could also explain why I may see full boost around 3500-3700 where as others boosting 8psi could see it sligthly quicker, no big difference though, and like they said too many variables involved...

 

JWT TT will be the quickest spooling, then APS, then Greddy then TN.

Spool time on ANY kit will be very quick and not worth distinguishing between. I have driven TT and ST and the spool time difference is noticable, but not substantial

 

I know the order, I didnt mention APS because the OP wasnt interested in that kit-hes a smart guy

 

my list or your list, TN is still at the bottom

 

you know what I always thought was interesting was people always saying how linear turbos are etc and how there's no lag on the Z.

Then people start threads like this and the subject is lag so it obviously exists - it's just not much compared to say a supra or turbo civic

 

as far as I am concerned the lag on a turbo'd Z is basically non existant. The ST I drove gets into boost almost instantly, and the twins, slightly faster. Referring to a turbo'd Z as having lag is really splitting hairs.

 

right so what is the point of threads like this if the lag is so small that it doesn't really exist? And why are people so concerned with it?

 

IDK???
ask Alberto or the original poster

 

Also depends on what gear, and how much load you have on the engine. Basically, the question cant really be answered. On the dyno, I have seen APS TT's spool just as fast as the Greddy TT's. It also depends on backpressure, the type of exhuast and downpipe you are using, cams, and just about everything else.

 

PETT has hell of a fast spool..........but im pretty sure JWT TT is the fastest, then APS, greddy

not sure on the ST tho

 

well my point was just that if there was absolutely zero lag, no one would even be bothering to talk about it if it didn't exist

 

All turbos will have some turbo lag. If you define turbo lag as the amount of time, when engaging in WOT operation, for positive boost pressure to occur, then there is virtually no turbo lag. If you define turbo lag, as the amount of time before full boost pressure occurs, then you are talking seconds, depending on how high you are boosting the engine.

The VQ35 has so much midrange trq, that most turbochargers will spool up pretty quickly, and you will have the impression that very little turbo lag exists. The engine just pulls and pulls!

 

My car or yours your still in my rearview at the track But I do agree with you man, the lag is minimal compared to other cars. Sentry-the ST's hit boost hard, when the power comes on the TQ is great, whereas the TT's seem to pull harder up top and come on smoother, at the end of the day, a Turbo on the Z is tons of fun