T&T Racing

In the videos, my observation is the car is understeering. Your not able unwind the steering wheel after the apex as quickly as a could if the car was neutral handing. The 3 front cars were much smoother through the slow speed corners. You would be able to pass those 3 front runners with an understeering race car.

Are you running a square setup on tires? I know you like the "apparent" adjustably of the Tarrets and sort of been married to them. I do not think there are your best partner. The MO30 front sway is non-adjustable but using a 3 position adjustable 19 mm sway bar provides the tuning ability for understeer/oversteer. Your are running late front LCA so the fitment for the MO30 sway is easy to do. I started with 26.8 mm and had to replace with a 25.5 mm,

endoquest

Duly noted T&T and thanks for the input. Funny thing about videos, they can never capture your actual, seat of the pants level of grip! I've got every incarnation of sway bar available and can revisit the front setup once I start testing the car again. I wish I had a crew at the track to spend less time wrenching and more time driving.
I still use camber but less than I used to since I'm using radial slicks. If I were to try bias-ply slicks I would stand them straight up but I don't think the 944 would like that. My tire temps are spot on with the camber I'm running, -2.5 front and -1.5 rear. By the time I figured out these Hoosier slicks I was starting with 18-19 psi instead of 25, huge difference, especially on the first lap, target pressure is 25-27psi. They just work way better at lower psi.

And I'm building another E Production motor........just sayin.

Jim H.

What happened?…Why are you building another motor?

endoquest

Nothing happened Jim, I'm pulling the current motor to check rod bearings, solid lifter wear and valve lash. Before I do that I might try a new ECU and tune it while it's still in the car.

I have spare 2.5/8-valve parts and want to keep pushing this envelop. I'm going to sleeve and deck the next block and use true 12:1 Wossners with gas ported rings. Also knife-edging the crank and more head porting. 10 more HP would be nice.

I have a spare caged chassis from my PRO44 days so I figured, why not? I have just as much fun building as I do driving. Win win situation, me thinks.

wildcat077

How are you going about your next block , are you going LA Sleeve for a 2.7 bore or something different like Darton ?
If you do what you plan , it'll definitely be more than 10 HP ...

Cheers
Phil

endoquest

Wildcat, Trying to stay in the SCCA specs for E Production. Light weight and handling over horsepower. Tough to beat the RX7s and the newer cars like BMW Z3s.

wildcat077

From your videos it seems like your car already pulls pretty well up to 7000 rpms ...
We have an 88 RX7 that races with us and he's very quick and well planted on the track !

Cheers
Phil

wildcat077

For what it's worth ... this is one of the creative ways we had to meet the new 92db sound restrictions at Circuit Mont Tremblant
at the Fall Classic this year.Picture is my friend's RX7 with his new plumbing !

Cheers
Phil

endoquest

RX7s have won a lot of races when they're tuned right and reliable. There are also a lot of competitive Miatas, believe it or not. And then there is Parker Johnstone in his Honda S2000 breaking track records. I really need to gain about a second a lap at most Northwest tracks to be nationally competitive. That may not sound like a lot but it really is. I gave up trying to get more torque but 10-15 more HP and 500rpm would really help.

wildcat077

Well , i did have a picture of my friend's RX7 posted yesterday , guess it was removed because i'm not a paying member ... oh well

endoquest

Well, it's been 9 months since my last post and the 2023 racing season is almost over. The ICSCC EIP Championsip is between me and my good friend Terry Overdiek in his RX-7. The 944 is still running really, really well. The "new" motor build never happened so I've been running my 2022 drivetrain in 2023. Why? Ask S.....F.....R...... VERY disappointed.
Anyway, the biggest difference this year is the switch to Goodyear bias ply slicks and changing all of the suspension (no camber) to maximize their performance.
Personal best times and Conference lap records have fallen. Not bragging for myself but for the true potential of an N/A 944! These cars ROCK!

924RACR

We're a bit late to the Prod party here; we've "converted" our 924 (2.0L) from ITB spec to H Prod... which is to say, thrown a modestly-built H Prod Limited Prep motor in an ITB car. Still even running SM R7.5 tires - takeoffs, to keep cost down. Motor prep is really just a fresh top end with a custom Elgin cam, and higher-compression Traum pistons on a solid bottom end. There's still more internal things we can do to the motor, both top and bottom end, but that starts to get spendy... mainly right now it'll be focusing on a Microsquirt conversion (still stock ignition and CIS), taking weight out of the car, and turning up the screws on the driver. Still have to decide if/when we're gonna make a jump to slicks or not; it's up to the driver and her race budget, so likely not any time soon.

Car was championship-winning and lap record setting in ITB trim, so has potential - chassis is definitely on form. But aspirations are a bit lower these days, so unknown that we even develop the car fully... driver may also be getting close to retirement!!

endoquest

Interesting 924 build, sounds like a deep rabbit hole. Join the club!

endoquest

Location is in my signature.

The new rule set for E Production allows for the 1989 2.7L motor at 2300lbs, 50lbs more than my current weight. I requested this change and got it officially accepted through the SCCA rule change process.
This will be my new target. It's an easy one since boring/sleeving a 2.5L block and 104mm pistons are the only changes. That or find 3.0L/2.7L blocks and use the 2.5 crank. Also, 48 mm intake valves were also stock on 2.7L heads. Porsche specs say this was only a 5 hp gain but we'll see about that.
Pulling out the 2023 motor right now. I'll check the internals in the next day or two.

924RACR

Runoffs aspirations? Though a bit of a tow, until they make another swing back out west... prior to that, only reasonable way would be paying a team up your way for a spot on a transporter...