I am going turbo, but I don't know whitch compressor to go with. I did a search for turbo in this forum and went through about 19 pages, and I saw alot of interesting stuff. I am a total newbi to this aspect of f-body's. I want 600+ RWHP for street/ pump gas, and all I can get with race fuel. I am dealing with induction motorsports, and they told me a PT 76 GTS would give me the power I want, and it would spool quicker than a T88. Also, the T76 is a smaller, and might be easier to package. I am not affraid of nitrous, in fact that is what my car has been for years, I am willing to use it if necessary. Weather or not I use N20 will have a DP system installed. My car is a street race car, it is not a trailer queen or an all out drag car. I go to track rentals about 2X a year to get my times/ kicks that's about it. I love street racing, and driving car where ever I want to go: be it the bar, a cruize school/work MPG be dammed. So far I already bought the T76 GTS (precicion) and a HKS GT2 waste gate, but I have not taken delivery yet. I want to know if I should re-consider my purchace and make my return now rather than later regretting it. I read somethings on here about back pressure Vs. Boost, I understand the concept, but I don't know how to manage it. I do not have any engine specs yet, because it has not been built yet. But, it will be a LT-1 (4 bolt, forged,... da goodness). I have the top end (ported heads ect...) I just need a short block. Either way I will start plumbing the hot side in about a month and buy the pieces as I need them to complete the project. I already have a good fuel system and a good # of strong drive line parts and pieces, the car is far from stock in its current state. I will elaborate on the parts as they become relavent to the topic.

 

A PT76GTS can support over 800rwhp on a V8, if everything is set up properly.

I don't like to speculate on how much power you could make on pump gas, because the variables are endless, and finding the limits of pump gas usually means breaking something.

And yes, it would spool faster than a T88.

 

Glad to see I am not the only one awake this late on a work day . Your point is well taken. I don't really want to test the limits of pump fuel, I would just like decent #'s with it simply for the purposes of all arround use. I will tune it conservativly for 93, but I will also have a tune for for 100+, and change it accordingly. There is a place close to me where I can get 100 octaine unleaded, but 93 is standard arround here.

 

600rwhp is achievable with good heads, appropriate DCR ~6.5 and such...

i did 607rwhp on pump gas with an Strim.. so a more efficient turbine should do a lot better... you can use alcohol injection for your pump gas needs.

 

Very good idea for pump gas setups. The kits are relatively cheap and could save your engine in the case of something going wrong and you over boost it. I could run 17psi on 93 pump in the GN without detonation. I later installed the SMC alky kit on it and could run 24-25psi on a cool day without knock. Not bad considering i ran and got the best results using straight 100% denatured alchohol (ethanol) with no water, and at $8/gal at lowes it's a good deal. One night while tinkering on back roads, i was trying to get the pump speed set set right and was approaching that 25psi mark when i had a wastegate hose pop off and it topped the boost gauge out at 30psi . If it wasn't for the AI, i'm quite sure that damn $5 hose would've cost me an engine. It's cheap insurance and can allow you to run better without the need for race gas.

I haven't kept up with the latest turbo innovations, but i read somewhere how the GTS series is one of the best yet. Better turbine housing and wheel for flow and boost response. So you'll probably be happier with the 76 like INTMD8 said, rather than the old dino-age T-88.

 

if you want to only make 600 to the wheels and use a direct port nitrous. you could cut the turbo out of the mix and save yourself quite a bit of money. and still reach that goal. I would think you would want to up you power goal for a fully build motor with two power adders.

 

I already have N20. I had 575 RWHP, and 618 tq. It ran 10.5 @ 128 1.43 60'. It was fun but I want that ammount of power available at all times. I will retain the nitrous system, and upgrade to a dp, if for nothing more than style points. Besides it would make me feel better to invest a little more on nozzles and distribution blocks than to try to sell it and get low balled by some guy looking for the deal of the century off my blood. I have (off the top of my head) about $2,000 in my N20 system (nothing but the best) what's it worth on this board..... $300. I would like to max out somewhere close to 1000 RWHP in full race trim (for the few track days I go to) And to do that without a larger turbo set up I might have to give it a litttle shot. Again I don't fully understand how N20 will react in this situation so I will reserve it's use untill I know more, but the system will be in place.

I don't want to be a d!ck, but did you miss the part about a pump gas tune, and a race gas tune?

 

The 76GTS is more then enough for almost any street setup. I have a customer that has gone 150+ in an LT1 with a 76GTS and 3680 lbs of weight. Its definitely a great performer. We made 1098rwhp with a 76GTS on a 3 rotor rotary 2 weeks ago. Of course this was at a much higher psi and PR which brings the efficiency of the turbo way up, but you can see it has plenty of airflow if combined with the right setup.

Jose

 

Glad to hear good things about it. I can't wait to set the system up. I am going to use a FAST system for tuning. Now all I need to do is sort out the short block and cam selection. And I have to sell my current short block, which I am not looking foreward to. Just thinking of the hassle and at least 50% loss on a perfectly good short block with less than 1K mi is giving me an ulcer.

 

i think the PTE 88 small frame(mid, really) is the best route to go- but just run a smallish A/R ratio

 

I know this is going to sound stupid, but what is an A/R ratio?

 

This will help you with understanding...

http://forcedinductions.com/help.htm

Jose

 

Thanks for the link. My parts are starting to show up! I just got my wastegate today, but my compressor is on a 2 week back order . I am expecting my FAST to be here in a few days. Now all I have to do is start selling off my other parts, and start tearing the car appart.

 

I agree with Jordan on going with an 88. I dont think you will notice much of a differance in spool up. Plus its always good to have some in reserve. My buddy has an T88 on his car, im not positive on the exhaust housing size but I think its like a 1.20's-1.30. His car with a 383 6spd spooled just fine.

 

Do you know what rpm is started to make boost, and where it was at full boost? And for the hedders, I was going to use 1 3/4" primary's and 2 1/2" collectors/pipes to the turbo housing, merging them at the turbo flange. That should be enough right?