Sprintex 335 Testing & Progress

[DeliciousTuning]

Originally Posted by moto-mike

That does have a good deal of merit, but the "safe boost limit" I think is still vague. We've installed and tuned a bunch of kraftwerks C38 kits which spin to 15 psi. No issues on them so far, many of which run pump gas. I've had several customers overboost to 17+ psi on bad wastegate turbo setups, all have lived with our failsafe using reduced timings.

But if you were to ask me two years ago what the safe boost level is, I'd probably say 7 psi then. What we're finding is that with the DI system at 17 psi and pump gas on the 12.5:1 CR we're running about the same ignition timing that we ran on the 10.5:1 MX5s at 9 psi. So that tells me we have room to go before autoignition. So we can keep cranking the boost up and do fine by retarding the timing to keep the pressure down on the ring lands and the rods/bearings. If I didn't think that was the case I wouldn't have run this on pump gas, but as is the case we did fine through several WOT runs in 4th gear.

That is not to say I would recommend it, but I think it can be done. With e40 and up it is a completely different animal though, and on e70+ we can hit the same timings we were running on the 210 kit at 12 psi. So the motor definitely can take it on e85.

Another very important point is that this is a supercharger. If you want to run 10 psi on pump and 17 psi on e85, it is as simple as making a map mode that limits throttle with EcuTek. That is a VERY effective way to control boost, and we've used it on poorly put together turbo systems that creep. Add in as much valve overlap as you can to spit fresh air out, and then close the throttle/kill ignition timing. Lots of backend work, but completely transparent to the driver. Simply a low/high power map when the fuel is right.

Good stuff on the 335 kit.

Could you add in a bypass valve to the system that electronically opens at various boost levels dependent on the ethanol content in the fuel? This way you could set the a 91 octane tune for 10 PSI and ramp it up to 17 PSI as the ethanol increases.

Might offer a better throttle feel and a lot less back end work on your end. Definitely understand that throttle control can be a pain to work with and prefer to use other options when available.

Cheers,
William Knose
Delicious Tuning

[Xero-Limit]

Originally Posted by D K

What kind of power are you seeing on E85 with this combo?

The c38 combo on e85 is capable of 400whp, at 7000 RPM

This combo should do about the same, but from 5000 rpm up. You'll need a header and bolt-ons, keep in mind our car was put back to mostly stock for testing since we're trying to determine viability on the stock motor.

Originally Posted by doberman8u

Hi Mike, what clutch do you have in this setup? Is it holding the torque well?

ACT HD disc, extreme pressure plate, with the Prolite flywheel. Working very well and better than expected I should add. I'm liking this combo better than damn near anything else we've put in over here. (mostly ACT street and Exedy units). Really need to add it to the online store as I have a feeling this will end up our default combo vs the standard HD unit.

Originally Posted by 2much

Do we expect this system to run well on 91 octane?

I am very interested in either this or OFT350 if that comes out... and 91octane will be the biggest factor

Nothing will be happy at 350 hp and 91 octane for long. For exclusively 91 stick to the 210 kit IMO. Note we did 328 hp and 280 tq on e85 with this setup in stock form.

Originally Posted by DeliciousTuning

Could you add in a bypass valve to the system that electronically opens at various boost levels dependent on the ethanol content in the fuel? This way you could set the a 91 octane tune for 10 PSI and ramp it up to 17 PSI as the ethanol increases.

Might offer a better throttle feel and a lot less back end work on your end. Definitely understand that throttle control can be a pain to work with and prefer to use other options when available.

You may be able to PWM a bypass using an eaton two port bypass valve, but I have a feeling it will be too choppy.

At this point we're going on over 1k miles on pump gas now, and no fireworks yet. I've even gone back up on the overlap to the close to standard values, and with proper timing we're cooking just fine even at 15-19 psi from 3500 to redline with no pre-ignition. So really I don't see an issue with running 15 psi with the proper tuning, if it doesn't detonate then knock and rod-bending/ring-land-cracking/head-lifting power can be easily controlled with ignition timing. Despite running timing very conservatively, 15 psi is still a ton of air 3500 rpm, and it feels way too good to want to neuter even on pump gas. Latest datalogs show no issue running pump gas. I even put two tanks of cheap 92 through it with the same result....

Again, the caveat is that the more you beat on it the higher the chance of wearings things out quicker and a big messy engine bay, but that is all easily controlled by throttle output. Of course we're doing it in the name of testing, so no restraint necessary here!

[2much]

Originally Posted by moto-mike

Nothing will be happy at 350 hp and 91 octane for long. For exclusively 91 stick to the 210 kit IMO. Note we did 328 hp and 280 tq on e85 with this setup in stock form.

Thanks for addressing my question... do you think 300 reliable whp is achievable on 91?

[Xero-Limit]

Originally Posted by 2much

Thanks for addressing my question... do you think 300 reliable whp is achievable on 91?

A turbo will have the most "reliable" hp for a given boost level due to the lack of significant parasitic drag. So if you're after a certain HP goal, that's the route you would take. However, if you want instant tire spinning torque even at lower RPMs, you'll never achieve that with a turbo no matter the HP level. So that is more pertinent to the SC vs Turbo debate when weighing the options.

[Mechazawa]

Originally Posted by moto-mike

A turbo will have the most "reliable" hp for a given boost level due to the lack of significant parasitic drag. So if you're after a certain HP goal, that's the route you would take. However, if you want instant tire spinning torque even at lower RPMs, you'll never achieve that with a turbo no matter the HP level. So that is more pertinent to the SC vs Turbo debate when weighing the options.

Personally I want to have my cake and eat it too, so to speak. I want the higher efficiency of the larger supercharger, but not the overly high boost levels. E85 is essentially unavailable in CT for whatever reason, but 93 is everywhere.

I wish there was a way to spin this blower a little slower, but baring that the cosworth or edelbrock (if it materializes) kits might be better options.

[Calum]

Originally Posted by Mechazawa

Personally I want to have my cake and eat it too, so to speak. I want the higher efficiency of the larger supercharger, but not the overly high boost levels. E85 is essentially unavailable in CT for whatever reason, but 93 is everywhere.

I wish there was a way to spin this blower a little slower, but baring that the cosworth or edelbrock (if it materializes) kits might be better options.

Same. I even messaged raceseng about sending a larger pulley to mike but apparently the process of prototyping a new pulley is too long and too much risk. I respect that he knows his business better than I do, but I'll admit I have a hard time understanding why it would take so much.

[Xero-Limit]

Originally Posted by Calum

Same. I even messaged raceseng about sending a larger pulley to mike but apparently the process of prototyping a new pulley is too long and too much risk. I respect that he knows his business better than I do, but I'll admit I have a hard time understanding why it would take so much.

To do the CAD/machine tool paths to make a new pulley, then the fixtures required, adds a good deal of cost to the idea. I think an 85mm pulley would fit and work, but it would take about 25 orders to just break even, maybe more. That would put this blower at about 14 psi instead of 19, which would be damn near perfect. In fact, if we could get 5 orders of the blowers, I would eat the cost of the pulleys but I'm not sure we have enough folks for that just yet.

[bfrank1972]

Originally Posted by Mechazawa

Personally I want to have my cake and eat it too, so to speak. I want the higher efficiency of the larger supercharger, but not the overly high boost levels. E85 is essentially unavailable in CT for whatever reason, but 93 is everywhere.

I wish there was a way to spin this blower a little slower, but baring that the cosworth or edelbrock (if it materializes) kits might be better options.

Not to get OT but if you want to have your cake and eat it too, maybe find a way to adapt this thing with its cvt drive to our cars:

http://www.superchevy.com/how-to/eng...ligent-design/


Sent from my iPhone using Tapatalk

[xwd]

There are a ton of domestic places who make custom pulleys if someone just wants a one-off. My TRD supercharger came with 6 pulleys and a custom crank pulley and from what I remember asking them it wasn't all that expensive.

[alexisfire02]

I have one of the 335 kits for sale. 3000$. Has about 800 miles on it. Comes with 4 pulley sizes and a bigger pump for the innercooler since the stock one will not cool very well.

[Mechazawa]

Originally Posted by alexisfire02

I have one of the 335 kits for sale. 3000$. Has about 800 miles on it. Comes with 4 pulley sizes and a bigger pump for the innercooler since the stock one will not cool very well.

I want it. Let me pm you.

[sam69]

Originally Posted by alexisfire02

I have one of the 335 kits for sale. 3000$. Has about 800 miles on it. Comes with 4 pulley sizes and a bigger pump for the innercooler since the stock one will not cool very well.

Why are you selling it alexisfire

[alexisfire02]

I prefer my turbo FRS.

[alexisfire02]

335 vs my gtx30r.