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Cars > Slycrew_Racing’s Garage > Blog

 

Slycrew_Racing’s Profile Photo

Slycrew_Racing

M –46
Milford, Michigan
United States

 
 

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progress on Split port heads

By Slycrew_Racing

Filed under: /blogs/browse/t/vehicle/v//p

I have my titanium valves ready and had new seats put in my new 99+ split port head castings and cut to my titanium valves. I'm going with 1.55 ex, 1.88" intake. Dave Dalke did an excellent job with the radius + many angle valve job and put a near mirror finish on the sealing surface.

I had an extra casting that I ported one cylinder on before I sent it to him, then he ported one cylinder the way he thought was best and flowed them. He beat my numbers on the flow bench by a few cfm. His cylinder was flowing 235 cfm intake and 199 exhaust. Last night I went to his place to pick up the heads and we started experimenting a little more with the intakes. After about 4 progressively aggressive port configurations, we ended up at 245 cfm on the intake with the 1.88" valve. I'm pretty happy with that. Now if I can duplicate that port job on the new castings, I'll be in pretty good shape.

Update

By Slycrew_Racing

Ran a 12.13 1/4 mile at the 2007 SC shootout in Dayton. Blew a headgasket. I've got the car torn down and next spring the plan is:
Roll cage - in progress
68mm Garrett Turbo - in progress
Paint - my graphic designer is working on proposals. I have received 2 death threats so far for proposing to paint over the primer flames.

More tuning

By Slycrew_Racing

My SCT BA2400 maf was pegging for some weird reason so I had to modify the inlet to the sensor. Now I have it peaking around 4.4v with my 15 psi boost setup. That should leave me plenty of room to go to 20 psi of boost.

My last datalog on 2/3/07 was showing that I've made progress in getting my fuel curve flatter. It's just a bit lean right now. It was 0 degrees F that day so that may have something to do with it.

Current status

By Slycrew_Racing

I just finished putting in the 60# injectors and the SCT Big Air 2400 MAF sensor. I had to fabricate a 4" aluminum tube with a bend in it to be my intake from the MAF to the throttle body. Since the TB is 86mm and the MAF is 90mm I figured there's no sense in necking it down to 3 1/2" between them.

My first file was giving me 10.4 AF ratio at an idle so I readjusted my MAF table and now it's right around 14.9-15. When it stops raining, I'll take it out on the road for some 3rd and 4th gear pull datalogs to see where the rest of the rpm band is at. Then it's off to Nelson's Performance in Waterford for a few dyno pulls. I plan to do a couple pulls with racefuel and no methanol injection, and then do a few with 93 octane and the snow system (50/50 mix of water and methanol). My last dyno at 377 rwhp was shut down at 5500 rpm due to a leaning out condition. Now that I have the 60# injectors, I plan to put the smaller blower pulley on and pull up to 6500 rpm. I'm hoping to get over 400 whp. We'll see.
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