12s finally

[kjewer1]

4500 on the odo and the old EVO finally ran a 12 second pass. Mods are exhaust, intake, boost controller. This was on pump gas. Here's an update to my local board.

Not a bad night over all. Not too busy, and it cooled off soon (but was humid, couldn't keep the windows from fogging without the AC). Went up with pump gas, no changes other than DSMlink. Went 5 mph faster and got it done 7 tenths quicker. Right up until the last run I was picking up 1-2 mph per pass by adding timing. The clutch doesn't like to be slipped at all. On the last run I let it out a little harder, still slipped, but was good enough for a 1.74, resulting in 12.74 at 108 mph. Timing was 12 degrees total. AFR was 11:1 according to DSMlink, 12.8 according to the wide band (exhaust leak? ). I couldn't get more than ~41 lbs/min no matter what I did with boost. On the highway driving home it was even cooler, boost peaked at 28 psi in the mid range, but tapered to the usual 22 psi. Airflow was 42 lbs thanks to the extra density mostly. Turned the MBC back down the two turns I added at the track, boost was 22 psi tapering to 21. 2 turns should have been a lot of boost, guess the turbo is maxed out, giving me more faith in the airflow numbers...

Cams at this point wont add any more airflow from what I can see, but at least I'll be able to do it at lower boost. I'll be going to the track Saturday to continue tuning on race gas or some mix, and get some practice on the pro tree before the shootout. I would say I'm going to work on the 60 foot, but I can't see the clutch cooperating.

[metalhedskater]

thats fucking awesome man....Probably get to 12s a lot quicker (time wise) in that car than our old beat up dsms. Man 12s just with those few mods....thats just crazy.

[MoozillaGSX]

you goto remember that EVO's have a way better drive train than most GSX's not to mention stock they have a 16g. of the floor they are awsome machines, cant wait ot get mine some day. i want the MR.

[scottsee]

i've been seriously considering trading in my 96 gsx on a base model evo.

[Black99GST]

yeah... mr for me too!

[guitarXgeek]

Very nice, Kevin! The fact dsmlink is compatible with Evos (well I say compatible but I mean that it can be done ) is the best news I've heard in a long time. I'm curious though, does it still offer all the neat features like the knock or coolant temp CEL?

After reading this, that you've trapped 108mph with just those few mods, I'm more tempted than ever to part out the gsx (while keeping a few parts that I can use on the evo) and sell it so I can buy an Evo Doesn't help that my local dealership has an Evo RS with like 12k miles on it for dirt cheap

Congrats on the numbers and I want to see 11's on the stock turbo, damnit

[joemathews]

Great driving, Kevin! I'm also interested in how much you were knocking, with only 12 degrees of timing advance and 12.8:1 on the wideband

That's kind of a lean A/F for our cars, is it not? I suspect yours is under warranty, so you're not super worried about blowing something up

Keep up the good work, and show us 11s on race gas and more boost (and maybe an aftermarket clutch, when your stocker dies)!

[JoeWagon]

That turbo is maxed out hardcore. I don't even think Kevin needs the MBC at this point (at the track). There is no boost left to add, and since pump gas isn't knocking, race gas isn't needed in the same sense that you could add airflow to a DSM. Could lean it out of course, but 12.8 doesn't leave a whole lot of room for that.

Now it's a question of whether you can stand a slow (yeah right) daily driver or if you're going to slap a 56 trim on there like I told you to. Do you have the 1g anymore?

[guitarXgeek]

I don't think the turbo is maxed out quite yet. I'm willing to bet some nice cams will be good for another lb/min or two. With cams, race gas, and a little more timing I'd say 11's are definitely possible with Kevin driving

[kjewer1]

Thanks for the kind words guys. I wont call it good driving until I get into the 1.6s though Damn clutch..

Well, some interestings news on this. I was talking to Bill Kehn, a local NEDSM member, while we worked on his 2g (he finally took out my local 2g record of 11.3, with an 11.1. That car will be sick soon). He also has an EVO with DSMlink and the same mods (cams already in). He said he was getting up to ~45 lbs/min at high boost with the cams, but it was colder out. I find it odd I can only get to 42 lbs now, I have to wonder if the BOV or something else isnt in fact hurting me for boost. It was holding ~28 psi in the midrange though. The BOV and such should not care what RPM the pressure is made at, it will just leak at a given pressure. But Bills numbers give me more hope! another 3 lbs/min is another 3mph, never mind doing it on race gas.

At any rate, he also has problems with his WBO2 matching the DSMlink estimate, and suggested that it may be the pump since they are not rewired in either of our cars. All of my calculations were done with the rewired flow numbers! So for shits and grins I turned the boost down to 15 psi on the way back home, getting 35 pounds/min, and WTF! the WBO2 matched my target 11:1 AFR. Holy shit... So I come home and do the math using the 12.5 volt numbers, and sure enough with AFR of 11:1, SG of .76, it will support 35-36 lbs/min. I love it when the math works! Once again, DSMlink has provided accurate usefull data that has allowed me to test a theory and come up with a root cause. I will not run a car without dSMlink. Ever.

So this means a few things. One, I was actually running 12.7:1 on my 108 pass, with NO KNOCK, on pump gas. These motors/combustion chambers are badass... Two, I can rewire the pump and be good to 45 lbs/min on race gas, and 43 lbs/min on pump, which is just enough to cover me. Sweet.

What a night... I can't wait to get the cams in today and rewire the pump, and run it saturday at the local Import event. Speaking of which, I need to find a way to pull better 60 foots without smoking the clutch. I am going to try a lower RPM to keep the speed differential lower, while using DSMlink's antilag to build more boost even at that low RPM to prevent it from bogging. By adjusting the MPH at which the antilag dissengages I should be able to work this out. I hope. I'm thinking of dropping RPM from the typical 5500 to 4000 RPM, and building ~5-10 psi on the anitlag if possible. I'll adjust accordingly. With any luck it will work and I'll be set for the shootout. I'm just too old for a twin disc install the day before I leave for Ohio

[guitarXgeek]

Originally Posted by 95 GSXracer

I will not run a car without dSMlink. Ever.

You know, if I didn't have dsmlink I'd say you were crazy. However, I can completely understand where you are coming from and I will keep my dsmlink chip/eprom ecu if/when I buy an evo Oh yea, quick question about that - did you have to wire in the complete dsm ecu to the evo or just use the dsmlink chip on the evo ecu?

Originally Posted by 95 GSXracer

So this means a few things. One, I was actually running 12.7:1 on my 108 pass, with NO KNOCK, on pump gas. These motors/combustion chambers are badass... Two, I can rewire the pump and be good to 45 lbs/min on race gas, and 43 lbs/min on pump, which is just enough to cover me. Sweet.

I just shit a brick as I read that. As of that statement I am now sold on eventually buying an Evo As if the the 4g63 in the dsms weren't amazing enough, they are 10x better in the Evos! It's almost magic.

Originally Posted by 95 GSXracer

What a night... I can't wait to get the cams in today and rewire the pump, and run it saturday at the local Import event. Speaking of which, I need to find a way to pull better 60 foots without smoking the clutch. I am going to try a lower RPM to keep the speed differential lower, while using DSMlink's antilag to build more boost even at that low RPM to prevent it from bogging. By adjusting the MPH at which the antilag dissengages I should be able to work this out. I hope. I'm thinking of dropping RPM from the typical 5500 to 4000 RPM, and building ~5-10 psi on the anitlag if possible. I'll adjust accordingly. With any luck it will work and I'll be set for the shootout. I'm just too old for a twin disc install the day before I leave for Ohio

You need the antilag to build 5-10psi of boost on the line? Does the 2-step on dsmlink not provide that much boost on the line? I'd think a with a 16g (although not the average dsm 16g) you could build at least 10psi on the line with the stutterbox Does the Evo not like the stutterbox?

[kjewer1]

I intend to use an unusually low stutter rpm, and am not expecting to be building much boost if any. At 5500 rpm straight stutter box I get ~7 psi. I know I used to get 12-15 psi on the 14b, and at elast 12 on a regular big and small 16g. I'm assuming the 10.5 cm turbine housing lowered it to 7.

I kicked on the antilag, no fuel added, default 10 degrees ATDC, and pegged the guage around 30 psi within like 3 stutters I played with the timing retard a bit and got boost under control at 0 degrees fixed. I'll try the same thing at 4k possibly move it up to 5 ATDC if necessary. Once I play with it some tomorrow I'll have a better idea of where I'll start at. The cams will also affect boost on the stutter, so I'll test it out with them in.

I have seen pics of used EvO pistons that were taken to show the superior burn pattern of the EVO combustion chamber. I wont pretend to be an expert on the subject, but from what I do know it looked very different from a DSM Very well done motor, finally.

Oh yeah, I was also NLTSing all shifts on my later passes. This tranny feels like ass when just driving around, so I didn't have high hopes. But when no lift shifting/stutter shifting, it worked like a champ. Very quick and smooth shifts, for me. Antilag is definitely not necessary on the shifts, this turbo respools almost instantly. .2 seconds in fourth to be exact. I also checked boost threshold last night finally. Third gear gets ~22 psi by 3300.

[Killa_DSM]

Kevin you are one crazy son of a bitch, you can make anything fast!!! Good job on the 12 second pass, so will low 11 seconds be anytime soon?


Keep the good work up and keep us updated!

[kjewer1]

Thanks Depends on how far I want to go with this car. It still has 4000 miles on it, hard to work up the balls to throw a big turbo on it. What I really need to do is build a full race 1g so I can leave the EVO alone I would like to hit 11s on the stock turbo, but I'm sure that is going to require a little twin disc clutch swap... I almost ordered it yesterday to throw in for the SO, but I don't want the stress that goes along with last minute work before the SO. I want the car done today... I'm too old for this shit.

[scottsee]

WOW! I'm ordering dsmlink & wideband this month. Even if my cylinder head blows up (agian)! Made it offical with the Fiance' last night. It was somewhat of a cold night for being August