Trying to size some turbos

[Zoie_daGT]

I am making plans now to TT my 2vGT. At the moment, I am doing my research so I can do this project properly.

I am, however, having trouble sizing turbos for the car. I plan on forging the engine and keeping the stock displacement. I am also aiming for 8.5-9.0:1 compression. Ideally, this car will be a street car with good turbo response. I plan on keeping on low boost(450-500rwhp) consistently and turning it up on weekends, track, cruising, etc.

I have been leaning for Garrett turbos. I like the idea of some being ball bearing and I also may be able to buy the turbos very cheap through my job. We sell Honeywell and have access to their products. Garrett is part of Honeywell so I may be able to get a great deal on them. Does anyone have any suggestions for sizing the turbos? I have read Garrett's website. I learned a lot but, got confused too. I have some experience w/ juice but, not blowers or turbos.

Any help is appreciated. Thanks.

 

[RussZTT]

Look into a set of 50mm turbos. Very good response (very low lag) but also make some great power.

 

[LS1PUSSOUT]

biggest i would go is 57mm turbos

 

[RussZTT]

biggest i would go is 57mm turbos

Look how much power he is looking for. Pair of 50mm would be perfect for him. Still, these size turbos will give him little more power than he is looking for but still able to run mid to low 10s on the weekends.

 

[Turbo04Mystichr]

i have a pair of 60mm's on my cobra. i like them cuz they make good power and spool rather quickly. i make full boost at close to 3,000 rpms. do you plan on doin single or twins?

 

[Zoie_daGT]

I plan on going twins. I like the idea of each header feeding a turbo vs. routing everything together. I know there is a bunch of plumbing but, that doesnt worry me.

 

[y2k2gt]

My vote would be twin 60's also.

 

[Zoie_daGT]

Wouldnt twin 60s be a bit big for a stock cubes 4.6L??? What kinda A/R would be needed??? From what I have been reading, somewhere around .60 would be pretty fast spooling.

 

[RussZTT]

Wouldnt twin 60s be a bit big for a stock cubes 4.6L??? What kinda A/R would be needed??? From what I have been reading, somewhere around .60 would be pretty fast spooling.

It depends what your goal is. Personally I think anything over 57's is to big for 6 speed street car unless you want to do a bunch of roll racing.

 

[y2k2gt]

I have a C4 transmission and my A/R's are .63.

 

[Zoie_daGT]

This will be a M5 or M6 car that will be going from a dig. Rolls will def. happen too but, digs are the primary goal.

Y2K- How is the spool time w/ that???

I have been looking at this:
TurboByGarrett.com - Catalog

 

[y2k2gt]

 

[Zoie_daGT]

cool video. Is that w/ the built Teskid??? That is what I am planning on building.

 

[y2k2gt]

Yes it was a built teksid. I messed that engine up. I'm about to drop a big bore teksid in next week.

 

[NITROS COBRA]

Go 50's

 

[Zoie_daGT]

Yes it was a built teksid. I messed that engine up. I'm about to drop a big bore teksid in next week.

Good deal. You going .20 over on it??? What compression are you running on this new build??? meth???

 

[y2k2gt]

The bore is 3.70 and the pistons are diamond 25cc. That should put c/r about 9:1. Yes, I'll be running the meth injection. Here is the new shortblock.
http://i160.photobucket.com/albums/t165/y2k2gt/103_3903.jpg

 

[teamstorm02]

i have the HP twin turbo kit at 8psi and im makin 430 to the wheels i have the twin 57 kit with the upgraded intercooler the turbos spool right at 3k which is nothing... look at the new mm&ff mag they have a 2v with the twin 57 kit forged internals and some head porting and its making 1006hp and 860somethin tourqe so if your lookin for serious power this is a good kit! me personaly i love it! since the day i put it in... plus i love the sound of them things spoolin up!:dancenana:

 

[Zoie_daGT]

I have looked at the HP Performance kit. Recently, I have heard a lot of bad things about them. The kit is supposedly good but, the customer service and lead time on the kits is outrageous. This is just what I have read though.

Y2K- That looks awesome. Are those sleeved cylinders or what??? I am arranging for a Teskid now and will be building that to drop in. Did you need to clearance the block at all for the internals???

 

[y2k2gt]

They are the Darton wet sleeves. All the internals fit without machining.
Here is a great deal on a HP kit.
http://www.svtperformance.com/forums/other-vehicle-parts-buy-sell-273/613411-hp-performance-stage-3-twin-turbo-kit.html