Sprintex 335 Testing & Progress

[Ron]

Originally Posted by alexisfire02

I'd like to see your torque drop offs.

We did dyno pulls with 68, 70, 72, and 80mm pulleys.

The torgue drop was worse every time we went down a pulley size.

In fact, the 72mm pulley offered the best looking dyno.

Hello sir, I am curious to know if you where running the stock inlet and TB while over spinning the compressor. I ask because I notice that you mentioned you had a hard time with controlling the heat of the 335. With stock 70mm inlet and TB, 68mm sc pulley on this compressor is really over working it. I have designed a 75mm billet inlet for a different application and I'm very concerned now that I may need to go 90mm, and that's on a 1.6L. For example, I used an undersized inlet and TB on my first twinscrew build. After increasing the size, I gained close 100rwhp. Got to love those Twinscrews!

On another note, why are there all these pics of guys running there filter in the engine bay? That can't ever happen with the Twinscrew compressor.

Ron

[Ron]

Originally Posted by moto-mike

Another issue though is the intake, we're hitting 5v on our big intake, which means you'd need a 3.5" MAF or bigger to flow what this would flow on a smaller pulley.

Excellent news. The 335 seems to have room to grow, though bigger TB will be a bigger challenge while increasing inlet size.

Ron

[xwd]

Originally Posted by Ron

Hello sir, I am curious to know if you where running the stock inlet and TB while over spinning the compressor. I ask because I notice that you mentioned you had a hard time with controlling the heat of the 335. With stock 70mm inlet and TB, 68mm sc pulley on this compressor is really over working it. I have designed a 75mm billet inlet for a different application and I'm very concerned now that I may need to go 90mm, and that's on a 1.6L. For example, I used an undersized inlet and TB on my first twinscrew build. After increasing the size, I gained close 100rwhp. Got to love those Twinscrews!

On another note, why are there all these pics of guys running there filter in the engine bay? That can't ever happen with the Twinscrew compressor.

Ron

I was kind of curious about the throttle body size as well. I have one of the TRD S/Cs (not twinscrew, but TVS 1320), and the kit Magnuson/TRD developed uses a 15mm larger than stock TB (stock is 65mm, the kit uses an 80mm TB). It's a roots blower but similarly sized to the Sprintex 335.

I've always looked at the IC as being the restriction with the Sprintex kits, but maybe that's not accurate.

People put filters in the engine bay because it's easy, although the Sprintex kits re-use the stock airbox so it shouldn't really be necessary.

[s2d4]

Originally Posted by dwx

I was kind of curious about the throttle body size as well. I have one of the TRD S/Cs (not twinscrew, but TVS 1320), and the kit Magnuson/TRD developed uses a 15mm larger than stock TB (stock is 65mm, the kit uses an 80mm TB). It's a roots blower but similarly sized to the Sprintex 335.

I've always looked at the IC as being the restriction with the Sprintex kits, but maybe that's not accurate.

People put filters in the engine bay because it's easy, although the Sprintex kits re-use the stock airbox so it shouldn't really be necessary.

Stock intake setup becomes a restriction over 300hp, apparently according to cosworth engineers.

[sam69]

Originally Posted by s2d4

Stock intake setup becomes a restriction over 300hp, apparently according to cosworth engineers.

So how could this be overcome as from what I understand the ecu calculates everything from the air flow through the MAF pipe and if you increase the size of the air flow straightener at the air box it causes AFR issues and similar with TB.

Why can't one just increase the size of the above (MAF pipe & TB ) and then tune accordingly

Give me a Weber carbie and I'll tune it but these thing confuse me LoL .

[s2d4]

Originally Posted by sam69

So how could this be overcome as from what I understand the ecu calculates everything from the air flow through the MAF pipe and if you increase the size of the air flow straightener at the air box it causes AFR issues and similar with TB.

Why can't one just increase the size of the above (MAF pipe & TB ) and then tune accordingly

Give me a Weber carbie and I'll tune it but these thing confuse me LoL .

You can, but the restriction at the box won't help.

[Ron]

Originally Posted by dwx

I was kind of curious about the throttle body size as well. I have one of the TRD S/Cs (not twinscrew, but TVS 1320), and the kit Magnuson/TRD developed uses a 15mm larger than stock TB (stock is 65mm, the kit uses an 80mm TB). It's a roots blower but similarly sized to the Sprintex 335.

I've always looked at the IC as being the restriction with the Sprintex kits, but maybe that's not accurate.

People put filters in the engine bay because it's easy, although the Sprintex kits re-use the stock airbox so it shouldn't really be necessary.

So 325rwhp was made by way of 65mm inlet? That is outstanding! Common forced induction fundamentals will tell you the outlet (intercooler) is always the bottle neck. However with a SC especially TS compressor, it is the inlet design that holds all the magic.

So it's a 70mm MAF sensor and 65 mm TB? Inlet increases sometimes can only be made by way of standalone, as the efi negotiation with stock Ecu can not always be accomplished.

Ron

[s2d4]

Originally Posted by Ron

So 325rwhp was made by way of 65mm inlet? That is outstanding! Common forced induction fundamentals will tell you the outlet (intercooler) is always the bottle neck. However with a SC especially TS compressor, it is the inlet design that holds all the magic.

So it's a 70mm MAF sensor and 65 mm TB? Inlet increases sometimes can only be made by way of standalone, as the efi negotiation with stock Ecu can not always be accomplished.

Ron

Why are you so adamant that 65mm would be a restriction at 325rwhp?

[Ron]

Originally Posted by s2d4

Why are you so adamant that 65mm would be a restriction at 325rwhp?

I think Mike mentioned he is maxed out on the inlet and needs to go at least 3.5 inch. That must be all the way through to blower to maximize compressor efficiency. When overspinning the 335, a 65mm TB is far too small for that size compressor. It's one of the biggest mistakes when trying to make big power out of a Supercharger. Choking the inlet will force the compressor to work harder especially on the top end, and especially while increasing compressor speeds. Effectively heating the outlet temps and lowering boost. 210 and 335 guys that are overspinning your compressor should take a boost reading behind the air filter. You'll find that you have a restrictive inlet at higher compressor speeds.


Ron

[s2d4]

Yeah, no.

[Xero-Limit]

Summer rubbers are on...finishing up the alignment and we should do some beating on the car again!

Thinking of doing a poll: What will break first?

Axles?
Trans?
Pop the motor?

Hopefully none of the above! Though we will put the 80mm pulley back on I think.

BTW we have an open house May 9th. Anyone wants to go for a quick spin in the car will be able to (passenger).

[Yoda]

Originally Posted by moto-mike

Summer rubbers are on...finishing up the alignment and we should do some beating on the car again!

Thinking of doing a poll: What will break first?

Axles?
Trans?
Pop the motor?

Hopefully none of the above! Though we will put the 80mm pulley back on I think.

BTW we have an open house May 9th. Anyone wants to go for a quick spin in the car will be able to (passenger).

Axles first then trans.

[smudge]

I reckon the driveshafts (axles) will go first

[Ultramaroon]

Originally Posted by moto-mike

Summer rubbers are on...finishing up the alignment and we should do some beating on the car again!

Thinking of doing a poll: What will break first?

Axles?
Trans?
Pop the motor?

Hopefully none of the above! Though we will put the 80mm pulley back on I think.

BTW we have an open house May 9th. Anyone wants to go for a quick spin in the car will be able to (passenger).

4th gear

Wish I was in PA. I'd love to do a ride-along.