I Busted the 12's!!

[UB2 SLOW]

Wow I was just looking at your Dyno graph. The power disappears after 5000. I always heard the L98 topped out fast, but thats the first dyno of an L98 that I have seen. I made 300 tq at 4400 rpm and 301 hp at 6200. Since you have such a huge torqe advantage, I am guessing that my higher rpms are what makes our times similiar.

 

[-=Jeff=-]

The power disappears after 5000. I always heard the L98 topped out fast, but thats the first dyno of an L98 that I have seen.

I need to dyno it again.. I ran my 12.82 last year shifting at 5800..

I ran my 12.74 this year shifting at 6000 or 6200 (forgot the shift light instructions to change it)

when I shifted at 5800rpm this year I could only get a 12.89

It is pulling to higher RPM with the SD system now

 

[True Duals]

My last dyno results were 301hp and 300tq at the wheels. The local dyno guru is having a special tomorrow. 4 pulls for $50. As soon as I get off work I am going.

My last run with the 96 was 293hp and 305 tq. This was with the 4:11

 

[maxrevs85]

Just curious. How do you know there was anything wrong with using the 58mm TB ? You had a few things that were not optimum and then you changed to the 52mm and corrected all the problems and even changed tires. Dosent seem like a good comparison. I have a 58mm and I'm not against trying the 52mm.

 

[UB2 SLOW]

Maxrev, The engine was bogging really bad at the low rpm band. Quite of few people told me that the 58 was too big for the 350. Once I have the car tuned really good, I plan on putting it back on to do some comparison runs.

 

[maxrevs85]

Ok cool, thanks for the reply. Its kinda funny, we all do mods , and some of us with the more serious mods have different problems and its good to hear it. You never know what ya might learn.

 

[SILVRTOY]

Fly Wheel HP

OK I have to ask. How do you figure FW HP to RWHP

 

[Fiddler's Gold]

I could get alot more technical....

but I feel that this simple guesstimation usually works ok ---

CONVERT REAR WHEEL HP AND FLYWHEEL HP

Flywheel HP = Rear wheel HP + 18%-20% (Auto trans)
Rear wheel HP = Flywheel HP - 15% (man. trans)

(Based on an average 15% drive train friction loss)

* Example: 300hp rear wheel dyno reading equals 345hp at the flywheel, or "engine stand" dyno

If you more scientific results - like those extrapolated from a dynojet report etc --- let me know ---

-=Fiddler=-

 

[UB2 SLOW]

SilvrToy, I have seen alot of people use the same numbers that Fidler quoted. Wayne uses 19% for autos on his dyno.

 

[True Duals]

Brian.......what does Wayne use for Std. then

 

[UB2 SLOW]

I think he uses 15%. I am getting ready to call him now and let him know that I will be coming out this afternoon.

 

[69MyWay]

I have to go out in the truck and dig up my time slips, but I think my best I could do last night was a 13.3 @ 106. That was with a 2.8 60 foot! I put the tires up in smoke through 1st and 2nd.

Then,.....bang., I blew the freakin clutch. More on that in another thread. I know I was set for solid 12 second action, I just had to hook up..

 

[UB2 SLOW]

Do you have a 427 in that 69? If so you want to trade?

 

[69MyWay]

Do you have a 427 in that 69? If so you want to trade?

Actually, a 454 punched .060 over with Edlebrock Aluminum RPM heads, RPM cam, Speed Pro forged pistons, and of course the hooker side pipes and Edelbrock Multi Port EFI on top!

But......................that was not the car I had at the track this weekend. I was running my 1990 with a .030 350, Edelbrock aluminum RPM heads, Crane 2050 hydraulic roller cam, roller rockers, TPIS mini ram, 52 mm TB, Headman headers, ZF six with 3.3 rear gears. However, it has a stock computer and injectors. I KNOW this car has 12's written all over it. However, it helps to have #1, a clutch that actually holds, #2, decent driver skill (which it has been about 8 years since I last hammered one down the 1/4 mile), and sticky tires.

Do I want to trade the 69, hmmmmmm, nope!

 

[UB2 SLOW]

:cry :cry :cry Ah come on!!!! Please!!!!!;worship ;worship

 

[SILVRTOY]

I can see more then a please being needed for him to part with his toy ($oy)

 

[UB2 SLOW]

Cant hurt to try.

 

[Edmond]

Actually, a 454 punched .060 over with Edlebrock Aluminum RPM heads, RPM cam, Speed Pro forged pistons, and of course the hooker side pipes and Edelbrock Multi Port EFI on top!

But......................that was not the car I had at the track this weekend. I was running my 1990 with a .030 350, Edelbrock aluminum RPM heads, Crane 2050 hydraulic roller cam, roller rockers, TPIS mini ram, 52 mm TB, Headman headers, ZF six with 3.3 rear gears. However, it has a stock computer and injectors. I KNOW this car has 12's written all over it. However, it helps to have #1, a clutch that actually holds, #2, decent driver skill (which it has been about 8 years since I last hammered one down the 1/4 mile), and sticky tires.

Do I want to trade the 69, hmmmmmm, nope!

How much displacement does that bump the 454 up to?

How much HP are the stock injectors good for?
How many more horses could you pull out if you went with say, a custom burned computer chip?

 

[69MyWay]

How much displacement does that bump the 454 up to?

I think just shy of 468 or in that ball park

How much HP are the stock injectors good for?]

On the big block, it is a custom design through Webber for Edelbrock and they claim to have pushed them as far as 700 hp. I am not making anywhere near that kind of power. On the 1990 model, I am of course using stock 90 injectors. Not sure what they are good up to, but the fellow at TPiS was not concerned that I intended to run them. They seem to work great for what I do with the car. Plus, I get right at 18-20 MPG when I drive the 90 to and from work!

How many more horses could you pull out if you went with say, a custom burned computer chip? [/B]

Good question. I have never put the 90 on a Dyno. The way I would find out is by putting it on the dyno and watching the air/fuel meter. Right now, even with the stock chip I tend to run fairly rich on all ends of the spectrum. I honestly don't know what more would do, maybe 10-25 ???? On the 1969, I start with a base calibration module, then adjust it myself up and down, side to side. More or less, I can create my own program within certain boundries.

 

[89ZZ4]

It's late, but congradulations on breaking into the 12's UB2Slow!
I was out of town on business late last week so just catching up on your thread, 69MyWays bad clutch luck and the ongoing saga of Ken's trip experiences. Last week I let my kid take MY vette to Route 66 for the last test and tune night to see what it would do.
Wasn't keen on the idea of him driving it before me but I could'nt make it early. When I showed up at 7 PM he was still in a tech line that wouldn't quit. They had well over 500 cars an we only got in 2 runs with the last at 10:30. Now with me having just replaced the slave on the clutch I was worried about this stock 89 clutch holding up and I wasn't happy about burning up my nice BFG KDs. I had never jumped on this car hard out of the hole until that Sunday night after I said "ok you can use the car". I tried a couple of back road burn outs and felt a 3500 K launch would be the best and traction would be a problem once they broke loose. No water box display. First run was bad with lots of wheel spin 3.081 60FT/1/4 - 14.47 @ 104.23. Second run a bit better with a 2.244 60Ft/1/4 - 13.71 @ 104.77. The Mustang in the other lane pulled hole shots on him but by mid track we blew by. Both runs were ended in 3rd gear with the 3.33 rear end. Only changes we had donwe to the car which was running Jeffs chip was to run the rear tires at 22 lbs and the kid did advance the timing another 3-4 degrees which I questioned the wisdom of considering Jeff had added plenty over stock on the chip he made for me. Now that I have some time I can get the EASE software and find out whats really going on to fine tune this thing.
It's obvious that the Z51 suspension system isn't made for drag racing as weight transfer is minimal. For me 1) get the chip tuned right, 2) drag radials on the back cause even stock sticky tires aren't enough and 3) a 4.10 rear end. I would like to think very low 13's @ 105-106 with a good tune and maybe 12's with the 4.10 and drag radials. One non funny car ran a 7.02 @ 258 that night but I loved this old primered T bucket that just drove to a almost 10's run at mid 120's - No noise, great hook up without lifting the fronts much - just went - ZOOM! First time back at a strip in almost 40 years gonna do this again! Phil aka 89ZZ4