New Track Times!

[UB2 SLOW]

I went to the track and here are my new numbers.

12.50@111.

My previous best was 12.79@107.

I just got the Rracetronix/Walbro fuel pump kit put on and it helped alot. I went to the Dyno prior to going to the track and I picked up about 5hp and 5 tq at the rear wheels all the way across. In some spots I picked up even more. I was having trouble with fuel starvation at the higher RPMs.

 

[Edmond]

I went to the track and here are my new numbers.

12.50@111.

My previous best was 12.79@107.

Excellent!

I guess you'll have to change your signature now. Are you shooting for 11's now?

 

[UB2 SLOW]

Thats my new short term goal. My ultimate goal is to get to the low 11's. I need to reinforce the tranny and swap my dana36 gears for dana 44.

 

[JT ZR-Won]

Great times!

Jay

 

[sothpaw]

high rpm

UB,

Who high does the auto go before it shifts?

Did you happen to put in your LT4 heads+ intake before the cam? If so, did you dyno that?

I'm wondering what would happen if I did just ported/polished heads and 52mm TB, AFR to get the tune perfect.

I'm worried about over-revving the LT1, as it was not designed
for operation beyond 5850 (stock rev. limiter). And my tach.
only goes up to 6000 anyway!!!!

 

[Ken]

Bryan,I was talking to a guy yesterday (Mike installed my roll bar) that has a '65 Corvette that runs in the 9's all day -- on ET Streets that are narrower than mine! His 60-foot times are somewhere in the 1.5 second range. :eek

_ken

 

[UB2 SLOW]

Re: high rpm

UB,

Who high does the auto go before it shifts?

Did you happen to put in your LT4 heads+ intake before the cam? If so, did you dyno that?

I'm wondering what would happen if I did just ported/polished heads and 52mm TB, AFR to get the tune perfect.

I'm worried about over-revving the LT1, as it was not designed
for operation beyond 5850 (stock rev. limiter). And my tach.
only goes up to 6000 anyway!!!!

I currently have it shifting at 6200 with the rev limiter set at 6400. I am making 317 rwhp at that rpm. The hp number is climbing on the dyno, but I dont want to rev much higher with the stock LT1 block and 85K miles. I did all the mods at one time, so I am not sure what the numbers are for each one. My base dyno was about 245rwhp.

Ken, that sounds like an awsome car. I would love to see it run.

 

[sothpaw]

Good to here that the LT1 can handle 6200 rpm. As I have to
shift by the tach (or sound), I can't conceive of going higher than
6000 without altering the dash.

 

[Vettelt193]

I think LPE makes a kit to modify your tach to 8,000 RPM... you can also change the color of the background if i remember correctly... i think most people switch to white, but i think they make it in red too.... I wouldn't go too much beyond 6000 anyway, so it is probably cost prohibitive...

By the way, most people tend to throw a cam in before doing all the work to the heads, intake, TB etc. The HP/$ of just a cam usually exceeds all of those mods.... but, after the cam, the HP/$ of heads, intake etc. is much better...

 

[UB2 SLOW]

I think LPE makes a kit to modify your tach to 8,000 RPM... you can also change the color of the background if i remember correctly... i think most people switch to white, but i think they make it in red too.... I wouldn't go too much beyond 6000 anyway, so it is probably cost prohibitive...

By the way, most people tend to throw a cam in before doing all the work to the heads, intake, TB etc. The HP/$ of just a cam usually exceeds all of those mods.... but, after the cam, the HP/$ of heads, intake etc. is much better...

I agree, you will pretty much limit the engine with just the heads and intake. You might as well gohead and do the cam at the same time. You will not be disappointed.

 

[UB2 SLOW]

A couple of other things. If you are going to change the heads/cam/intake, you should upgrade your timing chain to an extreme duty chain. Also, think about replacing the following, it will save you mega headaches later, I know;
Water pump
Opti Spark
Wires
Hoses(Upper and Lower)
IAC
TPS

You may also want to add the following:
52mm TB
Headers
Adjustable Fuel pressure Reg(helps in tuning)
bigger injectors(24-30)


After your cam you will need to have the computer reprogrammed.

Ed Wright(Fast Chip) or Super Chip

To put it all to the ground.
Stall convertor 2400-3000
Shift kit(if Auto)

Seems like alot, but once you get it all on you will be very pleased. If I left anything out someone please let me know.

 

[Vettelt193]

i think you got it all... I am glad to hear you finally got the results you have paid for!

 

[UB2 SLOW]

I am alot more happy than I was before. It took me a while to work most of the major bugs out. I still got a couple of small ones. Adding the 340 fuel pump helped alot. I forgot to put that in the list. I was getting fuel starvation at the higher RPMs. The new pump fixed that. I still need to fine tune the ECM. That will come once I get the new LT1 edit for OBD II cars. Its about $500 right now. I have to wait until after X-mas. I think I can squeze another .2 out with the ECM and then throw on some ET's and I should be about 12.0-12.2.

Do you know why an O2 sensor would keep screwing up? I have replaced it twice, but it keeps giving bad codes. I checked for shorts, but could not find any. I am thinking my cat is going bad.

 

[Ken]

I mentioned a guy I know that has a '65 Corvette running in the 9's on ET Streets, and that his 60-foot times are somewhere in the 1.5 second range. Well, I came across this picture of a couple of guys from the PSCA racing organization, Gordon and Mike (Mike was one of the guys the built my bar) in action at Speedworld in Phoenix, Arizona.

Hot Vettes!

_ken

 

[UB2 SLOW]

PSCA racing organization, Gordon and Mike (Mike was one of the guys the built my bar) in action at Speedworld in Phoenix, Arizona.

Hot Vettes!

_ken [/B]

I am wiping up the drool. Holy cow that is awsome.

 

[Vettelt193]

Do you know why an O2 sensor would keep screwing up? I have replaced it twice, but it keeps giving bad codes. I checked for shorts, but could not find any. I am thinking my cat is going bad.

what do they look like when you pull them? super black?

 

[sothpaw]

UB,
Wow, that's quite a list. The optispark/waterpump are already
on my "to do" list because of the age of the car.

Why'd you suggest the IAT, TPS change? Performance or maint. issue?

I know I'm a little unusual for not wanting the cam. My goal for
the car isn't as high as yours, I just want to get 12.9. I want a
one time mod w/little long term impact (so no changes to the
bottom end of the engine, don't want the high revving necessary
for the cam).

With your set up, did fuel economy go down or stay the same?
I imagine with the Ed Wright chip, you have to always run 93 Octane?

My car also must have the ability to be a daily driver. So I don't want to destroy the fuel econ. or always run 93 oct.

Beginning to think I should just look at an LT4 or wait and go
for a 98 6spd --my car will have maint. issues due to age.

 

[Vettelt193]

what are your current track times? I didn't think you were too far off from 12.9 anyway.

As far as cams go, you don't have to get a high revving cam... many are built that way for high HP numbers, so the companies can show huge HP/$.

You could even go with a 'cheater cam' to gain power.... this is a cam that has factory specs, with the exception of lobe separation. Lobe alone can give plenty of power... I wouldn't count out a cam just yet... there are many cams you can get that will keep good fuel economy, drivability, and do not require you to over-rev your LT1

 

[UB2 SLOW]

UB,
Wow, that's quite a list. The optispark/waterpump are already
on my "to do" list because of the age of the car.

Why'd you suggest the IAT, TPS change? Performance or maint. issue?

I know I'm a little unusual for not wanting the cam. My goal for
the car isn't as high as yours, I just want to get 12.9. I want a
one time mod w/little long term impact (so no changes to the
bottom end of the engine, don't want the high revving necessary
for the cam).

With your set up, did fuel economy go down or stay the same?
I imagine with the Ed Wright chip, you have to always run 93 Octane?

My car also must have the ability to be a daily driver. So I don't want to destroy the fuel econ. or always run 93 oct.

Beginning to think I should just look at an LT4 or wait and go
for a 98 6spd --my car will have maint. issues due to age.

I would change the TPS and IAC due to age issue. I did not change mine at first when I did everything else and they caused problems later.

My Car is also a daily driver. It is very driveable once you get used to the extra torqe. My fuel economy went up. I was average around 16 mpg in town with the 3.73's. I am averaging almost 18 now. My highway economy went from 24 to almost 27.5. I can get almost 29 if I keep it under 70.

I agree about the cheater cam. A cam will do wonders for your engine, especially if you have good heads already.

Vettelt193, The first ones I pulled were black. The second set was darker than new, but not black. Of course the second ones were not in there as long as the first ones.

 

[sothpaw]

3.73's??

UB,
What rear gear do you have now? I guess I lost track of your mods, I thought you had the stock gear. 12.5 is pretty awesome. I am still at 13.3s.

Thanks for all the advice on the cams, I will have to look in to the cost of putting one in with
all the other stuff.

Merry Christmas to you and Vettelt193!!