How fast is a turbo?
 

Just wondering how much quicker is the rx-8 with the greddy turbo installed and tuned? Will it out run a stock 350Z or STi? What is the 0-60? I know that these responses will vary depending on tuning, so no flaming!

it depends.... the greddy kit came with the emag.... which sucks extreme balls. Then they made another one.... a lil better but still sucks... if u get the interceptor that just came out... then u could push almost 300hp. it also depends on the psi. oh by the way... u will get lots of flamming... we get these posts more than the "i wanna see a red rx8 pic" so be prepared to be flamed have a nice day :)

Is this "National add extra letters to words" day??


To answer the original question, the Greddy turbo seems to be increasing people's 1/4 times by about a second. So if you were running 15's before you're running 14's now. (without the 7k clutch drop i suppose) Although, I don't recall seeing anyone run higher than 13.9.

The kit seems to boost mid-range power quite a bit, but off idle power and upper redline power isnt changed nearly as much.

The smaller turbo does allow the power to come on soon, but the car still isnt a rocket off the line.

Id say a greddy turbo RX8 will be very close to a stock 350 or STI from a roll.....off the line the STI would have a much better launch and the 350z would also get away from you. On a track the handling and braking on the RX8 are already very competative agaisnt the STI/350z so with the added power you should have noproblem with them.

I've raced both on the track and they fall behind. The sti is alittle faster than the 350 in the 1/8th but I was beating the 350s by more than a sec and the sti by about 1/2 sec.

Jamie

You still would not come close to a STI. You have better chances with a Z. STI's are running in the mid 13 high 13 second 1/4. They do 0-60 in well under 5 secs. With better tuning of the emanage you get close. Adrian (forum member) ran a 13.9 with his setup. But he spent a shyt load of time tuning his.

As has been said, you won't touch an STi from a dead stop. Not many cars can. From a second gear roll we put a Prodrive Stage 3 WRX (290hp, 290lb-ft) up against an un-tuned Greddy RX-8 and it was fairly interesting. The WRX would jump out ahead by a couple car lengths, but the RX-8 would gain some ground and ultimately pass the WRX as speeds climbed. Then they settled in and held steady with the RX-8 a car length or two ahead all the way to speeds I won't mention here.

The only caveat is that it was a warm night, and Prodrive does a very conservative tune, so the WRX may fare better in cool weather. This same WRX essentially runs even at highway speeds with our mildly modified 350Z, so between the three cars it's very, very close. And our stock-engined RX-8 now gets waxed by all three of them :).

Anyway, DPE does not advocate, condone or otherwise endorse street racing of any kind, but in the name of product testing we do occasionally visit a deserted road late at night to see how well modifications perform. We'll tell you a lot more once we get the turbo RX-8, 350Z and WRX out on a road course together, but that'll be another month or so.

Hopefully that gives you some idea.

hehe, i love stis! friend of mine has one, with 420AWHP, off the linee! is insaneeeeeeeeeee!!!!

that car is a monster from hell, everytime i drive his car n get back into mine, it feels like a auto civic... =[

ok, ok! back to the point. Basicly if the turbo is giving us about 300hp+ w/ the interceptor thats a good amount of power, so id say if we people w/ just the greddy and emang got around 13.9 w/o interceptor , I'm sure it would be a lower #


fanman , was nice enough to let me drive his 8 n he's got the greddy turbo, and all i can say is after i drove it , I WAS HOOKED! i was telling him i was saving to get the MS kit, iv had a change of heart. Turbo!! , but i think im going to get the interceptor first

So any guesses on the 0 - 60?

The 13.9 was done with the greddy turbo'd 8 with less power to the wheels compare to avg. turbo 8's. Not sure if it was a mustang dyno or not (if it was forgive me and forget what you just read). But if you have the interceptor and somehow pushing 300whp I don't think it be an issue getting deep into 13's.

there was a thread made on the 0-60 time a while ago, I think he said it was 5.3 or something, it was by lscaivo(sp). It was with a gtech.

My guess with an out the box Greddy setup ~5.3-5.6 (mid fives). Remember 5.9 ticks to 60 stock is with the abusive launch. With the intercepter--you could easily see times fall to high 4s/low 5s.

if you want your 0-60 lower , think about getting a, short shifter- flywheel-clutch-lighter rims


Also correct me if im wrong but dont the rb's swaybars eliminate most wheelhop?

The turbo isnt worth it at all if in my opinion. The times people are getting these things are so pathetic that i would NEVER get the current greddy turbo. POLAK ran 14.3 STOCK with 50 pounds of useless baggage in the car at the time, in hot weather (around 90 something i believe), and with a full tank of gas. Without those 50 pounds, cooler weather, and 1/4 tank, i see no reason why he wouldnt have been able to run a 14.2 maybe, just maybe a 14.1. If you dont believe me, i think he posted his slips on the forum. Nevertheless, getting down to a 13.9 from 14.2 with a turbo is SAD. Spend around 3000 or 3500 in NA parts (intake, exhaust, flywheel, midpipe, canzoomer or interceptor-X) and you will probably get close to 13.9. With the interceptor X, you can definitely hit the high 13 mark. Wait for the right turbo, and really get some speed.

exactly the reason im waiting, even though im soo tempted!, id rather wait and get some real power

Your basing that on the best time stock time anyone has reported, and the ONLY turbo time anyone has reported. Also keep in mind that the times with this turbo were with a boost leak, and only pushing 6psi, and holding at 3(?), which is not terribly impressive. He also improved his 1/4 by a full second if I remember correctly. Any of the turbo owners can tell you that their car is much faster than it was stock. So in order for your claims to be the least bit accurate, you'd have to give Polak a turbo, and have him launch the crap out of the car. If he could somehow manage that time N/A, I'd be willing to bet with 60-100whp extra, and a huge increase in torque, he'd be pushing low 13s, high 12s. Just my $0.02.

Does anyone on the boards have the PTP motor sports turbo? How much does that thing dyno at?

I don't think anyone has the PTP, yet.

As Moostafa indicated, the driver is a real intangible. Adrian's car was far from perfect, and I don't recall how much drag experience he has. Polak could simply be a much better driver, no offense Adrian, thus skewing the times. Too many variables to make a conclusion.

Another error in that logic is that you are comparing an Interceptor ECU to a Greddy emange turboed 8--a Greddy Turbo with an Interceptor is probably good for low to mid 13s--especially if the suspension is tweaked to reduce wheel hop

I'm not saying that the turbo cant give results like low 13's with an interceptor, and Polak maybe be a better driver than most at drag. But if he is, why would you get a turbo before you knew how to drag the car properly? I am also aware that he experienced leaks, and most owners have said their cars feel much faster, but if they are bad drivers with their turbo's, and can only get into the high 13's, why not just learn how to drive well and get low 14's stock?

I don't think you got what we are trying to tell you. There is only one reported person able to get low 14s n/a. On average the 8 is a mid-high 14 second car. You have to take that average into consideration, not just a freakish one time, one person result. That being said, taking the interceptor ems out of the equation, a properly tuned GReddy turbo should be good for mid-high 13s, which is a full second off stock, and a pretty significant difference. That alone makes the 4k investment worth it. You also have to think about the fact that most people don't drag their car, they just want some more usable power, which is what the GReddy kit is designed for. If you want 11-12s, I'd suggest taking the huge risk and going with speed force racing. But for those of us looking for better drivability, and at least a full second off our 1/4 mile, GReddy is the best alternative.

Also I think at the time, Adrian was only making 220whp, which is what a highly tuned n/a would do for twice the amount of money. Him managing to even get a 13.9, proves to me that he is a pretty good driver, but his car is far from its potential.

At least a full second off sounds good. I'd say stock should be 14.5. A second off, not even more, would be 13.5. Can you please tell me where i can read about a 13.5 sec rx8 with only the greddy turbo? Because i havent heard of one that had a proven 13.5 1/4mi.

Additionally, i understand not all people can go to the track and test. But what about a gtechpro. Even though they may not be accurate, im sure if someone got a 13.5 they would post it. How many people do you think have the greddy? Hundreds? and not one has posted on here that they got mid 13's with only the greddy.

Finally, the people who have the turbo say their cars are much faster. Why dont you ask Nemesis8 or someone else who had many NA mods done how their car feels. Last time i asked him about his car, he said he feels a big difference from stock. He felt torque, and the front of the car lifts from a standstill acceleration.

Do you guys think any of the other promised s/c out there will produce better results?

If you have a 220whp car with a boost leak making 13.9 1/4 miles, what do you think that most of the owners with around 250-260whp will make? I'd bet it would be...you guessed it...at least 13.5. For a true comparison, you need the same driver to do 1/4 runs in the exact same conditions. There aren't many, but those who have have knocked off about 1 second.

There was a person a few months ago that did a gtech run, and knocked off a little more than a second. Search around for it. Even then the whole gtech arguement will come into place.