Saturday night at the local race track, California Speedway in Fontana where they hold the NASCAR race, they held their Saturday night drags. Look for posts about "SLP Siamesed Runners" in the search section from myself and Jerrywho for details and pictures of the runners. Jerry's car is a 1992 Z28 with a 350 L98 and automagic. The heads, cam, and bottom end are all stock. The intake is from Edelbrock, with the SLP runners and ported plenum. He has a 3500 Yank converter, Hoosier drag slicks, and a Dana 44 rear end with 3.73 gears. Oh, and a 150 shot of nitrous.

Previous best with the long tube TPI setup was 12.38 @ 109 MPH. Last night, after some more tuning and chip burning, he went 12.11 @ 111 MPH!!! He backed it up with a 12.12 and a 12.18. I cant wait to get these runners on my car. With his stock heads and cam its definitely not pulling up top to take advantage of the shorter runner length. On my car it should make a great difference up top. Jerry might decide to go to the track again to get an 11.99 time, as his new 400 ci engine is not done yet, he's waiting for the camshaft. Then he's using an LT1 intake on the new engine and the runners will go on my car for testing.

 

What does he run off the bottle?

 

Sounding good, now just get them onyour car and let us know :-)

Im more than willing to cut and hack(my slp runners) if their is a greater purpose to be served :-) (speed that is)

later
Jeremy

 

i went 12.39 @ 109.02 on my SLP siamesed runners and edelbrock base with ZZ4 cam, stock heads (ported), stock lower, 3.27 gears, stock radial tires, and corvette converter 2100 rpm with 120 n2o. so it's right with me on the times. got more mph.

 

He hasnt run anything recently, but with a 2000 stall converter a year ago he went 13.75 @ 100 mph.

 

Sounds like it's the NOS not the runners. 100mph trap is only about 230-240 RWHP.
I say this because I ran a best of 13.8 @ 100 mph on a 2.1 60ft (street tires) in an 89 L98/auto with ONLY: Edelbrock headers, 3.45 gears, Flowmaster cat-back, cold air, AFPR and underdrive pullies. Everything else was stock (including torque converter)
I realize that I have more mods NOW (SuperRam) and cubes but I hit 110 MPH N/A
Hope to hit 12.7s with some DRs

 

A year ago he didnt have the runners. This is only the 2nd time he's been to the track with the runners. The first time only netted a small gain of about half a tenth. You can say its because of the nitrous, and I might agree with you. But we'll find out for sure once the runners are on my car. Stay tuned.

 

Yeah I think your test results would be more accurate since you have ran it without those runners but with NOS.

 

kevin: could it also be from the revised chip burning as well? I am aware that you know what you're doing (and posting), but I'm quite inclined to agree that the track results are inaccurate.

 

No, I dont use NOS or any other type of nitrous. My times are all engine. Jerry, the guy who designed and built the runners and is using them now, is the one who has nitrous.

 

Kevin - so you are swithing from TPIS LT runners to SLP ss runners?

 

He ran 111.+ w3:23 gears...He now has 3:73's that's why the low mph.

 

He ran 111 MPH with NOS though, the 13.7 @ 100 mph was with his old setup N/A. You can't drop from 111 mph to 100 mph with only gears.

 

Sorry, I saw the post from mrr23 and I thought it was you.
Either way you have baselined your car so you'll have a much better idea how much the runners alone will help your setup

 

You can't drop from 111 mph to 100 mph with only gears.

You can when the 111 was with NOS and the 100 was without.

 

LOL, true

 

New update: Saturday night at the same track, he raised the shot to 200+, and went 11.61 @ 115 MPH, on the stock engine. The best part is, it survived and he drove it home. Of course they booted him for no rollbar, and it was only one pass with that much nitrous.

Seems pretty good for an L98 with stock heads, stock cam, and stock bottom end. Now the 415 cubic inch small block with the custom LT1 intake and two stage nitrous goes in his car, and the siamesed runners go on my car.
:lala:

 

I think comparing times between the ported and unported runners when using nitrous is always going to show more gains than if no nitrous was used. Anybody else agree with this?

 

I agree. I can't get too excited hearing about a car that runs 11.xx in the 1/4 when it's followed by "on a 200 shot of NOS".
No offense to those with NOS, especially if you have more mods or a built motor.
I will highly interested when he puts that 415ci motor in though :hail:

 

I ran .1 faster when I put my Slp runners and my ported plenum on. I was kinda dissapointed.

 

Yah, I agree, I wish he could do it off the nitrous, but its a stock L98 engine and its surviving under that much nitrous. That's a good thing. How many 11 second thirdgens do you know about?

Plus, his 60' times are in the 1.5x range. That's some hard launching.

 

Yeah a 1.5x 60ft is awesome
I can't wait to get some sub 2.0 60fts
My best with my current setup is 2.2x!

 

OK, stand by guys, the runners should be on my car tomorrow for testing at Funtana.
N/A as in no juice. I have run 13.23 @ 105.65 with regular SLP's so this will be a real test. Last week @ Funtana I recorded 4 60' times of....1.84 1.82 1.82 1.82 with a best of 13.33, for some reason it wouldn't run on the other end, best of 102.50. Hope I have that issue solved.

 

curiously awaiting the results...

 

Well the jury is still out...because of a few other problems needing to be worked out but the results were definately positive.

They preped the track real well last night so not sure exactly where to place the credit.
I think I didn't get the fuel rich enough but here ya go....(790-830 02 volts)

Density altitude was kind of poor because it was so hot. (Fontana is 1400') It was 83 degrees at 10:00 pm.
1st run netted a 13.28@103.30 1.79 60' one thing I did notice, when it got to 5500rpm it didn't start laying down anymore.

2nd run netted a (after fixing problem) 13.01@105.20 1.77 60'

3rd run (running a little hot) 13.15@104.45 1.84 60' (had a VATS problem and didn't want to shut it off)

So all and all it was a good outting. Can't wait to richen it up and get back out there.
Don>>>

 

Maybe ya'll missed this post. (uh, update)

 

After the thorough testing of these runners I believe they will be the closest thing to an LS1 manifold you can get. I have measured the total runner length and it is almost the same. (11") These things allow the rpm's to just keep on climbing and never seem to fall off like LTR's. I was shifting at 5400rpm's. Too bad I didn't get the fuel rich enough (790-810 o2's). More later after the next test.

 

Thanks for the update...are you running MAF or SD? If MAF what are your MAF rates looking like? Do they flatten out on top? can you send a log file of a run....

 

Two 1992's and a 1991 car, that's speed density for sure. We wont run anything else but...

The runners are now on my car and it definitely pulls harder over 5000 rpms than it used to, but track times were disappointing. There must be something else wrong with my car as it hasnt run better than mid 13's since I put the T56 in.

 

Yea, but your ECM says otherwise! 127 in the 1/4 aint too bad!