Is SP stand for "Sound Performance" shop here in Chicago area?

 

Yup!

 

Ball Bearing FTW.

 

- If you want a monster, go see the guys at SP. Hook up with Tom or some of the other Chi-Town guys and go for a ride.... you won't ever look at your car the same way again

 

That's what I'm afraid of.

 

I disagree with Tom, being an auto, and assuming you want to hit your goals on pump gas I would say you DO need cams at a minimum.

BC2's + 18G should be 550whp on a bad day on 93, even on the auto. Sell the GTM IMO.

 

Are the dBB turbos really that much better than the Mitsu/GReddy 18 or 20G? I like the water-cooled effect to prevent coking at shutdown and a bit better turbo heat disbursement, hence why I went with PL over TN, but it operating temps, is there really a big difference?

 

Bert,
My car with built long block with head works, cams ...etc...CJM stage 2 FRS, RC 750cc, Meth injection, APS 2.5 exhaust, Crawford plenum, only made 523.xx RWHP on Injected PErformance's dyno with about 17 psi then It started to get into fuel delivery problem.

 

Thanks all.
Alberto I agree with you that I probably get more for the GTM, and as long as both kits gives me about the same output then that is what I will do.
I will probably use meth injection and I guess 3" exhaust to be on the safe side. My fuel pump should be able to handle all the fuel I need and then some, and I have some SARD 800cc injectors. Not sure about the cams yet, don't want to put more in there than I can use with the AT. But if cams will give me a better power delivery and some other benefits then I think I will go for it.
Thanks again everyone for all the advise, and if you have some more please let me know

 

IIRC they have a DD.

Every car is different, every tuner is diff, but if they do run a DD, your 523 is easily over 550whp on a DJ. You run cams/heads but only a 2.5" exhaust, the setup isnt ideal IMO-IM NOT downing you just pointing out key differences compared to my setup with a big exhaust and only cams with no headwork.

My car is a 6 speed, but with BC cams it does 605whp @ 13psi straight pump. Some shops/owners push harder than others, Injected is well respected and they know their $hit, but my point is it doesnt mean it couldnt make more with another tuner or another dyno. All reasons why we shouldnt chase dyno #'s....

 

Understand what you're saying Bert. My previous tune on a different dyno netted me 645 WHP and 670 WTQ LOL! I know the exhaust and injectors were preventing from getting more power. I always followed ur build up post and learned from there.

 

Yeah I have heard the same, follow Alberto's build and you will make good reliable hp over 600rwhp. I just hope the AT can hold up, they say between 550-600rwhp

 

i would go with the 18g's if i were going with greddy simply for the powerband and they will have plenty of flow to achieve your desired numbers. 20g's just seem to be a bit laggy on the vq35

 

how big of a difference is there in the spool characteristics of the GTM kit?

 

they would be within a 100 rpms is not closer

 

how much more lag does the 20g's have then the 18gs. my 18g's reach full boost at 3800rpms. what about the 20g's?

 

of all the dynos I have seen and compared with in my spreadsheet, it really depends on the tune and the build. no one has done side by side on the same build, but all else equal, less than 400 rpms.

no one has shown that the 20gs make that much more top end over a properly setup 18g to warrant the extra lag though.

 

Actually Greddy did 750whp on their 4.2 HR Z with the new 20Gs kit. I haven't seen anyone did +700whp (just boost) with the 18Gs!!

 

750whp "should" be attainable on a 3.5 w/20G's and proper setup, IMO thats weaksauce for a 4.2L

I have seen a 3.5L do over 700whp (DJ) with 18G's.

 

both kits are good. but i would go with GTM.

1) oil/watercooled
2) GTM is in the US. and lets assume a part was missing. comon. it will take a day or two to be shipped. and SAM is a great person to deal with. ( i got my kit from SAM and i am in the other part of the word and all the parts were there. not a single bolt missing ) .. i guess it happened couple of time before not now.
3) with the GTM kit you can upgrade up to stage 6 ( 900+ hp ) .. so the growth path is better with GTM.



GTM FTW .