the other day l was running my car down a street that was a few miles long, so l tried to top it out, and left it in OD when l hit about (what l think was 130-140) my speedo only goes up to 110, so l guessed, l think l hit 4th with it, it made a clunking noise when l hit 4th, and it started making a clicking noise afterwards, but l wasnt accelerating much faster after that happened, l got a pretty much stock 305, with a R4 trans and a set of 3.73's. l dont think 90 IROCs have a limiter on them, but l havent had enough road to experiment with it in the top end. anyone have any suggestions? l dont think my car reached top speed because the rpms are still pretty low like l still have another gear to go through.
any suggestions would be appreciated

thanks a lot

 

What exactly are you looking for suggestions to?

 

l was looking for suggestions as to weather or not l'm actually in over drive when that happens, or if my cars got a rev limiter, l dont think its supposed to.

 

i think you hit the rev limiter. 700r4 trannies don't shift into od at WOT. ain't gonna happen. and with 3.73's i don't think you were doin 130-140 either. did you have your speedo recallibrated? is yours tpi or tbi. TPI's have a governor at 105 ish. you were probably doin right around there.

 

It is possible to go WOT in OD but you need to modify the tranny(700r4). I'll look for the GM part # and post it unless someone replies with it before I do.

------------------
383 86 Camaro Z28
10.5:1compression Dart Pro 1 Aluminum heads 215cc>2.05/1.60 valves,400 steel crank,cam specs:224/234 at 050 525/525 lift,3500 stall converter,shift kit,3.42 gears,770 Holley Avenger,Victor Jr. Intake,true dual exh,Hooker headers with 40 series Flowmasters,MSD Coil and Module.ALSO SECOND GEN Z28---mods:454 BBC,.546 max lift(doug herbert cam ) 750 Holley vac sec. ,Edelbrock Performer manifold,Holley electric fuel pump,Hooker headers,Flowmaster mufflers,beefed up 700r4 tranny, 3.90 gears, powertrax unit, B&M console shifter.

 

I have part #8673948, but I have never verified it.

------------------
1989 IROC-Z 5.7L
NOS 5151 150HP kit
ProBuilt 700R4, PI Vigilante 2800 stall lockup
Baer Brakes 12" Sport System

 

if l shift from 1 to 2 and then 2 to D then D to OD manually will it hit OD?

 

I believe the thing is that anything past 3/4 throttle it won't go into OD. I personally have had mine (89rs 305tbi) up to 125mph before the speed limiter kicked in, I know this because the car I was racing (conquest tsi) had a speedometer that went higher than mine which goes to 115mph. My speedometer has been off a few miles an hour for a while and it progresses at the speed gets higher so maybe this eas why I could that extra few miles an hour.

 

all speedos are off at high speed.the most accurate way...when you see a speed trap, turn around and go back by it at wide open throttle. then you will get a "time slip" of how fast you were going.
but seriously..
if you know anyone with a motorcycle (yamaha r6 in paticular) they have speedos that go upward of 200-220ish
and the yamaha has the most accuate speedo in production right now.
but any motorcycle will give you a better readingconsidering they go up so high you wont have to guess

------------------
87 z28 bowtie aluminum 420small block dry sump crower lt. wt. knife edged crank oliver lt wt rods brodix track 1's super ram intake slp 1 3/4 headers accel dfi art carr 700 r4 3.42 gears ssm sub frame/ladder bars.....other parts on the way ,soon to be finished!! couple more weeks!!!

http://people.ne.mediaone.net/gdm

 

my 92 z28 goes into overdrive at wide open throttle. it usually shifts into od around 100 mph. i was told the last years of the 700r4s were updated and this is one of the updates. it also doesnt downshift into 3rd at 1/2 throttle like the older ones like the one in my firebird.

------------------
92 z28 170,000 miles 14.20 on goodyear eagles before exhaust only mods k&n and slp 13/4 headers and dual 2 1/2 exhaust
87 trans am 12.20 on motor too many mods to list

 

One more time , it is possible to go WOT in OD even past 3/4 trottle. I know this for a fact!

------------------
383 86 Camaro Z28
10.5:1compression Dart Pro 1 Aluminum heads 215cc>2.05/1.60 valves,400 steel crank,cam specs:224/234 at 050 525/525 lift,3500 stall converter,shift kit,3.42 gears,770 Holley Avenger,Victor Jr. Intake,true dual exh,Hooker headers with 40 series Flowmasters,MSD Coil and Module.ALSO SECOND GEN Z28---mods:454 BBC,.546 max lift(doug herbert cam ) 750 Holley vac sec. ,Edelbrock Performer manifold,Holley electric fuel pump,Hooker headers,Flowmaster mufflers,beefed up 700r4 tranny, 3.90 gears, powertrax unit, B&M console shifter.

 

My sister