I just bought a B4C car with the LB9 T-5 combo and it has 3.42 gears...about what did they run stock?

 

high 15's i believe

 

If its a B4C, then I'm pretty sure it should be G92 as well so expect anywhere from mid 14s- low 15s depending upon tune, clutch condition, driver capability, and if you're a mile high like Stu, Altitude.

 

My 91 Formula, LB9 - 5 Speed with G92 ran a best time of 14.1.

My only mods were K&N Filter, Modified air filter canister, TB ports of plenum cleaned up, and 8 degrees of base timing, and a flowmaster exhaust. I was running 275's at 22 lbs of pressure rear, and 38 lbs up front on 245's. Have not owned that car since 2001, so not sure I still have the time slip. I was shifting the car @ 4800rpm to get the best times.

That time came late in the season, so I had plenty of cool air (and I was icing the plenum).

 

With a good driver, good tune, cool temps and such. I'd expect low to mid 14's.

 

know what it could run and what it will run are two differnt things. i mean i have sen L98 vettes run 16s because they beat the hell out of the motor till it was just poo.

 

mid 14's if the car is in good shape, yes b4c's are g92's actually they are more powerful, stock this car should have 270+ hp and some decent torque, may i ask how much you paid for it the guy i bought my roc from wanted 13k for his b4c. but the car had 42,000 miles and was mint, it also pulled my car without a problem.

 

Stop BS'ing, it just confuses people!! They did not come with 270hp for the record!

 

I Dunno where the 270hp came from LOL It should run mid to low 14s in good tune

 

my G92 LB9 GTA ran a 14.4 with 36,000 miles and all the original factory equipment....with a flowmaster muffler, K&N filter and the EGR walls ground down it ran a 14.12@96....they are pretty fast if there drivin well...

 

low 15's

 

look up a TGO mod name BORLAZ06, he ran a 14.5 i belive with his bonestock LB9 1991 Z28

 

It is a G92 car and also has the 1LE rpo code. It is pretty much a stripper model, no power windows, locks, not even a rear window defroster, it does have air, tilt, and cruise. It has 3.42 rear gears, so with the lack of options it should be somewhat light. It only had 230 or 235 hp just like the regular LB9 cars, the "police interceptor higher HP engine" was only available with the synthetic blinker fluid option. Oh yeah, the car has 136k on it, needs paint, but other than that is in pretty good shape, I paid $3400 for it.

 

all depend on the year of the car the mid 80's LB9s (205HP) maf were in the 15's. The cars with SD were alittle faster

 

All my info is in the sig...230hp/300ftlbs according to the tech data on this board.

 

didnt notice you were only including the later SD LB9s with 230 HP. sorry

 

were talkin about the SD 1991 Z28 LB9 T5, those can run mid 14s stock

 

were talkin about the SD 1991 Z28 LB9 T5, those can run mid 14s stock

 

were talkin about the SD 1991 Z28 LB9 T5, those can run mid 14s stock

 

no need for apologies...your car looks like it would run

 

thanks .... it turned a 13.21@104.6 with external engine boltons listed in sig. its an L98

 

a 85 LB9 auto ran the 1/4 in 15.1@92mph.... lol. Damn slow LB9's. lol. j/k

 

Were you running at altitude or in 100 degree heat?

 

just incase yall missed that

 

what do mean.??.. no it was @ sealevel and 55*. If your saying the cars turning a bad time with with just external engine bolton your way off. If you read a post in the TPI section of this site "12.99 possible STOCK heads STOCK cam, STOCK bottom end w/external engine boltons N/A" you'll see no one to date has been able to break into the 12's and I'm in the 13.20's to date. There are 200 repleys to that post over 2 years and most think its not possible. There are afew other guys running mid 13's in the same criteria. but Your probably the one guy who can do it with a K&N filter and flowmaster

 

i have an 86 iroc auto that ran a 15.3 with k&ns and a flowmaster exhaust. gotta remember this i the year with the really crappy cam (all of em suck) but this one was by far the worst for a tpi car.

 

I'm not saying it's a bad time. I was just curious as to under what conditions you ran that time. No, 12's are not a K&N and Flowmaster away. I'm still running STOCK heads, cam, TB, intake base, runners, bottom end, torque converter, PROM, rocker arms and 3.23's though. I know the thread you're talking about. Not a doubt in my mind it's possible. I'd like to see it done while retaining the TPI LTR set-up. That's the real challenge!

 

to be proved im not a bull ****er, i knew i had it right, im an idoit read 350 over 305, sry about taking so long.

In the data section because Iroc-Z.com is gone, "Then the B4C police package was added, then it was equipped with the Corvette L98 5.7 aluminum head motor, fitted with siamesed intake runners, and then tubular headers. This brought the horsepower rating up to 270."

 

That's in reference to the Special Edition 25th Anniversary car that was never made. Prototype "Yes" Actual Production Car "No"

 

I managed a 15.44@93 mph with my old 1988 LB9/5 speed combo. Managed that with 140k and 100% bone stock (including GM muffler system that rusted and fell off the next week). Didnt get too many runs with it, but with 93 mph traps (sea level) that can make mid 14's with traction.

 

production car no does it exist yes and dont forget the slp cars, twenty or thirty something of them same rating

 

Your post above said "stock THIS car should have 270+ hp". I didn't know we were discussing the SLP Fire Hawk or the 25Th Prototype in this thread.

 

the SLP firehawk was 350+

 

the SLP firehawk was 350+
the SLP optioned TPI cars were almost 270HP...it included the hi flow base siamesed runners tri-Y headers a hot PROM and a dual inlet CAI

 

Yeah, I know. It was also a L98, not a LB9.

 

yeah i also whent 15.3 and it's a 86 the worst of all

but a lb9 305 5-speed should go mid 14's stock