-wrong thread-

 

If your wondering why the hp/tq doesn't cross at 5250rpm, it's because the values are not matched up on both sides.

 

Can you record a datalog of your boost curve with your Interceptor and post a copy of it? We're dieing to see how that external wastegate affected things.

Awesome results though!

 

adrian didnt you replace the greddy turbo with a bigger one ???

 

jesus, Scott gets one day with your car and hits 310whp!


hahahaa...all I can say is my car is next the mazsport queue!

 

You had Scott fly to Toronto to tune your car? That's insane!

 

It's amazing what cold Toronto air will do providing you get enough fuel to it!!

 

I posted in another thread, that once the Renesis gets properly boosted in mass numbers, and we get them all tuned right, all the other car forums will suddendly change their attitude about the RX8 and it's capibilities. My hat's off to Scott for another sound tune job.

 

The problem with that statement is their cars are slightly better performers from the factory, whereas we have to spend a fair amount of money to overtake them. My $0.02.

 

I know, but at least we can give them a run at the track now

 

A run?

All you need is about 280 to the wheels to beat them in a straight line!

 

Have you Dyno'd your car yet MadDog? or maybe done a 1/4 mile run? I'm curious. :P

 

Scott's the freakin' man! Now if I could just find a free weekend...

 

good job Scott!

 

I've been tempted to go get dyno'd, but I haven't done it yet. I want to get an exhaust first. I'd like to do a before and after, but at $65 just to strap it down, I'm starting to loose my willingness to do experiments!

I can tell you this though. I can beat stock STi's by a length in something close to a quarter mile and I think the stock STi is in the low 13's. I run wheel-to-wheel with a slightly modded (catless) STi.

I definitely go to the dyno after installing the exhaust in a week or two. I want to know, too!

 

You have an all OEM exhaust at the moment?

 

MadDog, which exhaust are you going for?

 

Yeah, I still have the OEM exhaust. I've been eyeballing the TurboXS exhaust, of course. But at a grand, that's pretty steep. There's a guy here in town that will fab a custom 3" exhaust for about $350. I'm thinking of going that route. I mean, for the cost of just the TurboXS midpipe, I 'll have the entire thing. I'm willing to bet that most (>85%)of the gains from the TurboXS setup come from stripping the cat and the 3" tubing - not anything to do with the quality of the Y joint or the mufflers. So the cost savings will more than outweigh the couple of HP that this guys custom jobber might lack.

 

cool

 

The greddy turbo is too small ( for big gains on the topend ). fact. it's cfm above 7500 rpm is too low. it may handle 20psi at lower rpm ranges but it isn't flowing enough air at higher rpm ranges ( it works fine on a skyline or other car where this isn't a problem ). the pressure is irrelevant, it's the amount or air that the car needs. if you want more power you are going to have to move the turbo ( not enough size in the "greddy position down low") do your own manifold.. and get a bigger turbo.

 

Bullseye actually makes a new compressor housing for the greddy turbo that keeps the same hot side and mates it with a t04b compressor wheel, that fits in the current location;

 

I'am glad to see the power is getting up there, mine is 284whp with the Greddy. But like your graph my boost falls off too at around 6500.

What I'am hearing is that it's not the Greddy turbo so much as they believe the intake on the engine can't flow enough. I hear there will be testing to compare the same turbo on a
13b, all things being equal..

I hope this does not prove true. Unless someone makes a new intake manifold at a decent
price... Maybe it would be nice so we can have a nice polished intake... We'll anyways that
what I hear...

 

Depends on what the user wants, it sounds like this turbo is well matched to this engine for low-end response which is what the engine needs the most

how soon do you get boost? I'd like to see a boost curve

I call BS,

the Renesis has the largest intake ports on any rotary ever. They're about the same size as a LARGE street port on an older 13B. Unless Mazda designed the runners small to keep high intake velocity, but then the engine would've had smaller ports.

 

Whoever is saying this has no idea what they are talking about. The Renesis can easily flow as much as a 13B. It had better. It has bigger ports and a better intake manifold! I wouldn't worry too much about this being true.

The turbo is too small to do much more. Scott is doing a great job of getting every last little bit out of it but it's just not capable of much more. Don't get too concerned about the rpm's as much. Think about it this way, would you rather have a 310hp engine where the power peaks at 7000 rpm or would you rather have a 310hp engine that has it's power peal at 9000 rpm? I know that people would rather have the same power curve but have it keep going up past 7000 rpm but from these 2 options I'd rather have a 7000 rpm redline. It is less stress on the engine than a higher redline.

Someone will need to install a nicer larger turbo to get more power and have a higher rpm range but for what this one is designed for, it's pretty good. It may be hard to get a different turbo down in the same spot. It should be possible to do a slight compressor upgrade in the same location but I seriously doubt it would be a huge gain. You will really need to move the turbo to a different location with more room so you can fit a larger one. The turbo manifold is a pretty big compromise from a design aspect in this location anyways.

Just be happy that it cracked the 300rwhp mark. We are slowly seeing the power on these engines go up which keep proving those people wrong who say it can't be boosted without blowing up. It's all in the tuning as has been proven.

Who will be the first to 325? 350? 375? 400? We'll find out yet...