atb

Read 'em and weep guys:




Cheers to John Thomas Denali and Chuck Ahrens, looks like all this development time is starting to pay off.

The 12.4 E/T includes hitting the rev limiter in third gear. They are going to dyno the car this week and see where they are at. They were shooting for 400hp to the rear wheels. I'm sure the numbers will be posted after they get them.

More details at their website.

Looks like the market will soon yield another viable option for 928 forced induction.

AO

Very nice numbers. Can't wait to see the dyno numbers! Congrats!

atb

They had capped out at 380hp/436 ft lbs and diagnosed that the high flow cat they were incorporating in their system was causing some problems. That was removed just prior to going to the strip, and the next dyno session should show the results.

Jim R.

Nice!

I've got to borrow a new style G-tech after I get the final fueling/tuning finished (closest track is about 2.5 hours away ).

Jim

Courtshark

Great numbers and very interesting install idea.

The driver needs to work on his RTs. He'd have won the first race but for his RT. Rev the engine to 2 - 3k, clutch in, when the second yellow flashes, release the clutch and let fly. These RTs indicate he is waiting for the green light to flash; it takes your brain at least half a second to process the info needed to launch. Thus, launch on the second yellow. I promise you won't red light it so long as you wait for the second yellow.

atb

Hi Mike,

I think JT would be the first to admit that he could work on his launch technique. He actually did a lot better this time then he did last time as far as not breaking the tires loose on the launch.

It's an A/T, so it's basicallly a powerbrake start. What has worked best for me is to powerbrake to 1K rpm at the tree, and launch at the last yellow like you stated. I've experimented with power braking at higher rpms, but it just results in wheel spin or inconsistent R/T's because you're really fighting to hold the car back.

Win or lose, the E/T's are really good. I'm wondering if there are any S/C'd guys out there running similar boost that have shown a similar quarter mile E/T either via a G-tech or actually at the strip.

atb

Hi Mike,
I misread your original post, I see that you launch on the second yellow. I've had the best luck launching on the third. Whatever works though. I can say that my best R/T's have been in the .55x/.56x range, so I could definitely launch a little earlier but I've also redlighted a couple times too. Better safe than sorry. (or DQ'd)

Abby Normal

Nice times! Is that car an auto or manual?

hacker-pschorr

Sweet!! Need more details like tires and pressure.

You guys could make some good money at the Friday night open drag nights up here. No one would suspect anything. They do not post the times on the score board, so there is a lot of Pinks style bluffing in the line up.

Courtshark

Depends on the tree, actually. A "standard tree" or so I'm told, has only 2 yellows. Sounds like you may be on a "pro tree." The point being... we both launch on the last yellow.

I assumed it was a manual when you said he hit the rev limiter in 3rd. Did it bounce off? Was he manually shifting the auto?

I agree with your launch technique. With a turbo, a little more than 1k rpms is probably necessary to really get the impeller spinning.

89 928 turbo

I wish I could say it was my twin brother driving, but launch technique will come with more practice (pairing off with some of the big pony cars was great), it was fun to see the potential of the RMT emerge....a lot of folks were pretty surprised.....for a street car.

.........who can tell me what they know about methanol injection?

atb

JT, were you manually shifting or did you just leave it in "D"?
Can't the shark tuner adjust where the rev limit kicks in? Maybe raise it another 500 rpms to give you some head room.

89 928 turbo

Hey Adam,

We started in first (gear lever in second position), lifted to 3rd at shift and D" right away. We think the rpm rate of rise was pretty quick at the end and blew by the rev limiter faster than it shifted.....and did exactly what you are suggesting, using our Shark Tuner, we raised the rpm fuel cutoff to 6510.....and expect that will take care of it. Having the ST is super at the track....run like heck, log the data, tinker a little and have another go....another advantage is that we are thinking about making timing and AFR baseline chips available for induction cars converter over from stock....and they may be a better optomized based on what we have learned. Especially the timing side, we were on the dyno for about 5 hours before this last track event and even though we stayed conservative, have it dialed in pretty close for both the cruise map and WOT map and the car is humming.

RicerSchnitzzle

It will allow higher boost with out detonation. Helps cool the charge prior to ignition as well as resisting detonation. Plus the methonal is cumbustable adding slightly to the out put. However the same or better effect can be gotten more reliably from a small (50hp) nitrous shot. More cooling and more power. But don't add more than 75hp under boost or you're back at detonation issues. Also the nitrous can be programmed to hit harder prior to turbo spool time giving a flatter torque curve. As the turbo takes over the nitrous backs off.

SwayBar

Congratulations and nice numbers!