Rothsport 964..Jenvey ITB..Motec M84..development car

[rsscotty]

This is a comparison of our 964 Jenvey ITB engine to a 964 stock block engine with Motronic

Rothsport 964 stock long block except for camshaft change
Jenvey ITB
Motec M84
Stock wiring harness with PCB board gender changer, black PCB board cover not shown
Upgraded Bosch EV6 injectors
Elgin camshaft upgrade, 1 bump up over stock camshaft
Stock heat exchangers with CAT, primary muffler & secondary muffler J pipe bypass
Bosch LSU 4.9 lambda closed loop
Oregon DEQ compliant
LWF with no stalling...OEM idle valve


Stock block 964 comparison engine
OEM stock single throttle body
Motronic ECU with Steve Wong chip
GHL headers with Monty final muffler
Air flow meter delete replaced by Split Second MAF
OEM injectors


Dyno results from Superflow engine dyno.. numbers are crankshaft horsepower

[bug man nrg]

looks like a clean set up

[Bill Verburg]

Nice! Is that the Elgin Super C2 cam?

[rsscotty]

Bill,

I mis-spoke on the Elgin cam. It was a Web Cam we had on the shelf and wanted to try.

Web Cam 20/21
Lift 485I 452E
Duration 238I 226E
Centerline 113I 112E
Camtiming 1.9-2.2mm

Specs on a stock 964 cam
Lift 464I 426E
Duration 236I 226E
Centerline 113I 112E
Camtiming 1.25mm

Elgin C2 Sport
Lift 491I 455E
Duration 247I 230E
Centerline 113I 111E
Camtiming 2.4mm

[Trophy]

How about a break down in costs? Can PM if you like.

[Alan Goettel]

Nice Set Up!

Great Info. That Blue 964 is sure beautiful.

Alan

[Raceboy]

I made similar swap (standalone ECU using factory wiring but with direct ignition) few years ago on bone stock 964 (even had original cats in place).



Dark blue and dark green graphs are with stock ECU (it produced 156 rwkW).
There are number of runs, I left the violet one to ECU as I made the ignition a little bit safer side. This car uses stock catalytic converters.
Results: car made 172 rwKW and 296 rwNm.

ECU looks like this:


Car looks like this (of course the 964 is chasing Cayman):

[jstyer]

I usually stick over at R-list... But sweet build my man. I've also thought about doing something with Jenveys and the stock intake plenum. What kind of air filter cone do you have on there? Is it just stuck to the end of your MAF?

Forgot to add... What kind of linkage setup did you go with? Did you just sort of piece together a kit by yourself?

[Nickmysta]

Great build - would you mind sharing the rough cost of the jenvey + plenum intake?

I have PMO ITBs on a 993, with an RSR type cam, and I really regret not going with this type of set-up instead.

Any idea if I could leverage some of the existing PMO linkage to do this?

[rsscotty]

Shown below is a picture of another engine with the ITB setup and our linkage. We have a custom tee pipe we use for the air intake off of the plenum. No air flow meter or MAF involved in the system. Another picture of our linkage pivot piece with fuel line hookup and OEM 993 fuel pressure regulator in the same piece.

[rsscotty]

Another picture of a carbon GT3 intake on a 3.6 race engine. Air filter was zip tied to plenum for dyno tests only. Proper clamps were added later.

[H20 LOL]

Thats one mean looking intake and filter.

[jstyer]

Originally Posted by rsscotty

Shown below is a picture of another engine with the ITB setup and our linkage. We have a custom tee pipe we use for the air intake off of the plenum. No air flow meter or MAF involved in the system.

Duh ... No maf on itb setup. Sorry about the stupid question!

Again, really great looking rig. I talked to Jeff about it last week. So so tempting.

[rswannabe]

What were the numbers for the motor with the GT3 intake and muffler?

[rsscotty]

If I remember correctly they were 365 crank hp.

[Sire]

wich type exhaust is the last one.

[rsscotty]

Rothsport designed headers, transition pipe and 997 GT3 Cup muffler

[Sire]

I cant find the headers on the site, but do they come with heating?

[rsscotty]

Rothsport has a new short tube version that comes with heat for a 3.6 engine. This uses any dual in muffler for 74 and earlier cars, although we have found the Dansk Sport and Monty mufflers work the best.

[jstyer]

What kind of DB readings do you guys typically see at WOT on the long tube/gt3 cup muffler setup?