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Rothsport ITB 3.2 new build
This is our most recent build for a customer. It is a 3.2 with 964 cams, unleaded premium pump fuel, custom 964 resonance plenum, stock cylinder heads, B&B headers with heat, our custom shortened 997 muffler, tailpipes will be configured to exit cars bodywork, Motec M84 dual lambda, coil on plug with external ignitors. A duplicate intake is being painted the same color as the upper valve covers.
269 hp with a long flat torque curve. Should be fun to drive. http://forums.pelicanparts.com/uploa...1491686463.JPG http://forums.pelicanparts.com/uploa...1491686541.JPG http://forums.pelicanparts.com/uploa...1491686573.JPG http://forums.pelicanparts.com/uploa...1491686624.JPG http://forums.pelicanparts.com/uploa...1491686654.JPG http://forums.pelicanparts.com/uploa...1491686675.JPG http://forums.pelicanparts.com/uploa...1491686695.JPG http://forums.pelicanparts.com/uploa...1491686716.JPG |
Yowza. What lead to the decision of the 997 muffler?
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Why not a 991 muffler?
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Dyno graph?
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I dig it. Excellent work.
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Assuming the t-piece for the air filter and the one below with the resonance flap also fit a 993 plastic intake?
If so, am I able to buy these parts individually from you? |
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The 991 muffler is similar, but uses 3 pipes since it has the vacuum operated valve for noise or quiet mode. |
Whats the width of the muffler? By shortened do you mean the entry to the muffler?
Although there has been a reasonable increase in hp and torque, im sure with the ITB this engine is rather snappy. Why did the owner choose not to increase the displacement? |
That motor wants 993 Super Sport cams.
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The client is always right, but I know what I like. I have them in my high comp 3L SC and loooooove the top end shove.
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Is it just the lighting or is the upper valve over on the right side a different colour than the left?
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Thx |
The headers look gorgeous... Any chance of a better photo?
http://forums.pelicanparts.com/uploa...1491686654.JPG |
SmileWavy
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Some of our EFI parts are only available within an assembly. You can check with Jeff, as he makes those decisions.
rothsport@frontier.com |
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The width of the muffler main case is 24" after our customized shortening. http://forums.pelicanparts.com/uploa...1491852923.JPG http://forums.pelicanparts.com/uploa...1491852923.JPG http://forums.pelicanparts.com/uploa...1491852923.JPG http://forums.pelicanparts.com/uploa...1491852923.JPG |
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We built a 3.4 with different cams and exhaust, same comp ratio and cylinder heads that made 310 hp @ 6500 compared to this engine 270 @ 6100. The 3.4 torque 232 ft lbs @ 4100 3.2 torque 210 ft lbs @ 4100 The upper range of torque 3.4=258 ft lb @ 6300 3.2=222 ft lb @ 6300 |
I went the 997 muffler route also. it's pretty tidy and was able to be modded to work with my SSI. That said, the SSI's im using may be too small for a 7500 rpm 3.0.
http://forums.pelicanparts.com/uploa...1491855257.JPG |
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Thanks for that, will drop Jeff an email |
[emoji44],any chance that would pass cali emissions?
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Those are superb figures - my 3.4 with dc20 and the standard exhaust hit 270bhp/245 lbft after a live remap. I'm now moving to a 3.5 via a Gt3 crank, William Knight cams, ITBs and 993 plastic plenum. My main restriction will be the SSIs however i hope to match your figures |
Finished engine
This is the look after all the painted pieces arrived.http://forums.pelicanparts.com/uploa...1491866544.JPG
http://forums.pelicanparts.com/uploa...1491866544.JPG http://forums.pelicanparts.com/uploa...1491866544.JPG |
Work of art!
My only question is why was there no SCL on the ends of the shrink at the connector ends? The glue lined shrink helps to resist water infiltration into the harness that heat shrink alone will not prevent. Just food for thought. |
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OK, I think I want one. Nice looking hardware.
How does that plenum work compared to something like Borla or PMO itb? Could it be adapted to my hot rod 3.0 with TWM ITB Stacks with Elgin Mod S cams? ...just curious is all. |
OH, We need a sound clip too.
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Beautiful work as always.
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Wow, wow, wow Sent from my iPhone using Tapatalk |
Really nice work.
Is the resonance plenum 'passive', ie does it work simply by its geometry/shape?? Or does it have active valves that open and close?? If it is active, what controls the valves?? What program?? |
The resonance plenum is functional and programmed by the Motec M84 auxillary output function based on engine rpm. They typically switch between 5100 and 5500 on this particular intake and are tuned on each engine for the best power and least disruption of the torque curve. Inside the smaller cross tube (in the center) is the butterfly, which is either open or closed depending on rpm.
There is a vacuum canister which is a OEM 964 part and I use an OEM vacuum valve along with a Pierburg 993 style switching valve. |
Is that the vacuum canister beside the air filter?
http://forums.pelicanparts.com/uploa...1491686573.JPG http://forums.pelicanparts.com/uploa...1491866544.JPG |
Very cool. I'm surprised it's not done on more ITB setups (although who doesn't love those stacks).
Is there room to change that air filter without pulling the motor? Is there less room for a filter facing forward? I guess it interferes with the decklid, or perhaps there is turbulence by the fan? |
The air filter is easily removed with the engine in the car.
On our Spec 911 race cars we have the filter facing the rear as the race deck lids have clearance for the air filter. |
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I wanted to ask about the K&N filter, having read some mixed reviews of K&N/paper filters generally, versus say, foam filters.
Has your testing proven they're the best product, if so based on what criteria? |
Jeff, the owner picked this particular filter when he initially designed his system and also works on our GT3 intake system for larger engines.. It is always available and fits his space requirements. This filter seals well and we never find any particals inside the intake or engine. This filter also cleans well at the service intervals.
The foam filters we have used on our stack engines are OK when new, but they are a pain to service, they deteriorate with time, and they don't seal well to the intake and let too much debris in. |
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I shall email Jeff now re the intake parts i need. |
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