Sprintex 335 Testing & Progress

[bfrank1972]

Originally Posted by Calum

Obligatory what fuel were you using? Also, what size pulley are you running these days?

Thanks for keeping us updated.

Given the torque numbers, and the fact that it still has factory exhaust, I predict its some higher percentage ethanol mix with a larger pulley (70mm or a bit bigger). 290 torque is insane - and I'm sure it's in the high 200's over most of the rev range. Beast.


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[Xero-Limit]

Originally Posted by Calum

Obligatory what fuel were you using? Also, what size pulley are you running these days?

Thanks for keeping us updated.

Originally Posted by bfrank1972

Given the torque numbers, and the fact that it still has factory exhaust, I predict its some higher percentage ethanol mix with a larger pulley (70mm or a bit bigger). 290 torque is insane - and I'm sure it's in the high 200's over most of the rev range. Beast.

E70, 80mm pulley still. We're up about 10 hp from the winter numbers with the header change. Likely a bigger effect since it was cold then and warm now, and both are uncorrected.

Now, we did some additional testing today going down as far as a 72.5mm pulley. This places the blower at a speed that should allow for the rated 500 engine HP or about 430 whp. However, looking at the data, we see airflows that are only up about 10-15% in the mid-range. Power is up there clearly--we're spinning in 4th on RE71Rs--but up top we have nearly identical air flow values over 6500 RPM. So either belt slip, or more likely we have an intake or exhaust restriction.

To figure this out I retrospectively went back and compared airflow values of JRSCs, KWSC, and turbo cars. What I'm seeing is that we're hitting a similar value at the very top end, but with this kit we're seeing higher boost levels to achieve the same airflow. What I think is happening is that we're either choking the blower on the intake side (throttle body) or choking it on the exhaust side (header/exhaust). The exhaust makes more sense since we're seeing a high boost, but low airflow scenario. We see a very similar thing with plugged up cats.

Recently we did a massive 2" primary header for a 2.5l NA MX5, and picked up significant HP as a result. I bet we can achieve the same thing here.

The good news? I really think there are not going to be many issues running this kit on pump gas with the 85 or even 80mm pulley, and 80 on e85 for sure.

With whatever restriction we're seeing, the actual load on the motor is not really all that huge. So yes, you do see high boost levels going into the motor, but that is a measure of restriction rather than workload. The actual airflow consumed is what really represents the load on the rods/ring lands etc...and all of those are not far off from turbo setups we've done that have lasted quite a long time.

In fact, the June 1st track day we have scheduled might very well end up with this car.

Until then, here's a video of some torture testing, including some 5th gear runs on the dyno (processing but should be ready shortly):

[ame]http://youtu.be/NyCVyrOAKWM[/ame]

[brianhj]

You're doing the lord's work, moto-mike

[stockysnail]

Originally Posted by moto-mike

E70, 80mm pulley still. We're up about 10 hp from the winter numbers with the header change. Likely a bigger effect since it was cold then and warm now, and both are uncorrected.

Now, we did some additional testing today going down as far as a 72.5mm pulley. This places the blower at a speed that should allow for the rated 500 engine HP or about 430 whp. However, looking at the data, we see airflows that are only up about 10-15% in the mid-range. Power is up there clearly--we're spinning in 4th on RE71Rs--but up top we have nearly identical air flow values over 6500 RPM. So either belt slip, or more likely we have an intake or exhaust restriction.

To figure this out I retrospectively went back and compared airflow values of JRSCs, KWSC, and turbo cars. What I'm seeing is that we're hitting a similar value at the very top end, but with this kit we're seeing higher boost levels to achieve the same airflow. What I think is happening is that we're either choking the blower on the intake side (throttle body) or choking it on the exhaust side (header/exhaust). The exhaust makes more sense since we're seeing a high boost, but low airflow scenario. We see a very similar thing with plugged up cats.

Recently we did a massive 2" primary header for a 2.5l NA MX5, and picked up significant HP as a result. I bet we can achieve the same thing here.

The good news? I really think there are not going to be many issues running this kit on pump gas with the 85 or even 80mm pulley, and 80 on e85 for sure.

With whatever restriction we're seeing, the actual load on the motor is not really all that huge. So yes, you do see high boost levels going into the motor, but that is a measure of restriction rather than workload. The actual airflow consumed is what really represents the load on the rods/ring lands etc...and all of those are not far off from turbo setups we've done that have lasted quite a long time.

In fact, the June 1st track day we have scheduled might very well end up with this car.

Until then, here's a video of some torture testing, including some 5th gear runs on the dyno (processing but should be ready shortly):

Cool beans. Once you guys get the 335 completely sorted I may want to upgrade my 210 to the 335. More power never hurts unless you blow an engine or spin out into a ditch!

[LS1M]

I'd like to see a run with the hood down. How loud is it compared to a centrifugal blower, at both part & full throttle?

[Xero-Limit]

Originally Posted by LS1M

I'd like to see a run with the hood down. How loud is it compared to a centrifugal blower, at both part & full throttle?

[ame="https://www.youtube.com/watch?v=1zh7886tuKI"]Moto East Supercharged Intake - YouTube[/ame]

This is with the 210 but awfully similar. The SC whine is substantial with our short intake. Even with a perrin CAI it is much more subdued. Barely audible with a stock plastic intake.

[350matt]

is this all on a built engine or stock engine internals?

[Kodename47]

Originally Posted by 350matt

is this all on a built engine or stock engine internals?

Stock

[LS1M]

Originally Posted by moto-mike

This is with the 210 but awfully similar. The SC whine is substantial with our short intake. Even with a perrin CAI it is much more subdued. Barely audible with a stock plastic intake.

That's kind of what I figured. The larger blower won't be spinning as fast so I guess the pitch wouldn't be quite as high, but there's no mistake it's a blower. Main reason I'd prefer the 335 rather than getting the 210 & upgrading later ... Don't want to advertise something that I can't back up on the street


So the whining noise is actually coming out the air filter, and the longer the intake tract, the less noise. Interesting.

[brianhj]

Originally Posted by LS1M

So the whining noise is actually coming out the air filter, and the longer the intake tract, the less noise. Interesting.

The whining is from the spinning of the lobes inside the supercharger. The shorter intake just allows more of it to be heard since it reduces the number of noise traps (resonators, air filter box, etc) in the intake system.

[sam69]

Pics of the stock 65mm TB against the Raptor 80mm TB that I just recieved.

[Calum]

@moto-mike, could you post a dyno plot showing a 210 vs 335 on pump gas, both taken to what you feel is the max for the compressor?

[350matt]

Originally Posted by sam69

Pics of the stock 65mm TB against the Raptor 80mm TB that I just recieved.

cool

is that a like for like fit in terms of bolts holes and electrical connector?

[sam69]

No I will have to modify the SC manifold to take the big TB .

They are both 6 pinouts on both TB's but I have to get hold of the wiring diagrams for both vehicles to see if I can make an adaption harness so if anyone has these for either TB and post them up would be much appreciated