hi every1 ive been googlin jetfires for around a hour, i think the turbo on a classic is neat!!! how fast are they tho?? ive owned 4 nationals so i know a v6 turbo can be very fast im just curious how fast a jet fire was than and now???? was it just for freeway passn when the turbo spooled up or did it have major exceleration top and bottom like a national??

 

I doubt the early '60's vintage turbo will perform like the turbo on a GN.
Also, we're only talking 215 cubic inches.
The novelty would be great and I'd love to own one, but performance wise,
I'd say no comparison to a GN.
In '87, GN was fastest U.S. production car, faster than a 'vette.

 

thats 2 bad!! i seen a 69 chevelle wagon with a 350 and a aftermarket single turbo that car was insane fast!! i was hoping 2 hear the jetfire was a runner

 

i think that was an 87 GNX

 

the GNX wasnt a production car it was special order they only made around 550 or so, the regular grand national was a production car and up untill like 95-99 it was said 2 be the fastest production car made, viper or vette passed it than, a stock grand national with just a walbro 340 fuel pump, up graded injectors, and 3 inch down pipe will run mid-high11's, ive owned 4 grand nationals 3 pretty much stock 1 that was kinda built it ran 10s on stock tires 342 rear gears and it still had major top end!!! i still love grand nationals but there 2 hard 2 keep up!!! im stickn with 68-72 olds!!

 

so does that make the h/o not a perduction car ? I have always liked the 89 turbo t/a myself.

 

The Jetfire turbo was about "state of the art" engineering, not hot-rodding an engine. It was never intended to make a fast car out out of the Jetfire. It was intended to further new technology. And it did show how forward thinking Olds engineering was.

 

547 GNXs for 1987

 

my buddy is as big of a fan of the GN as i am Oldsmobiles. it sure is surprising just how fast those 87 GNs are. he said the same thing about needing to keep up on them.

 

so are those little aluminum blocks pretty weak then? I know they're only 215 ci. but with enough boost..... i suppose the heads suck though.

 

im not sure about the H/O i would guess its not considered production because of how it was built, but thats just a guess!! i also love the 89 turbo ta if i had a extra 100k id buy a gnx or a turbo ta!! my friend and his father own mizzi's automotive in fairfield ca, there the top grandnational shop in nor car, they own a 89 turbo ta pace car, around 6 grand nationals and im guessing 7 other classics

jensenracing77 i dont know why but GN's fall out of tune slowly threw the month!! if your air, fuel, timing are not adjusted they stop running hard and you chance detonating!!! you cant ever run them low on gas or you chance detonating, ive blew a head gasket out the block tring 2 get 2 the gas station on the free way!! they are very fun 2 drive when tuned but very hard 2 keep up!!!!!! you have 2 know all the tricks 2 own 1!!! cold plugs, cold thermstat, high octane gas, regular computer adjust, tcb adjusted smooth, and many many more WAY 2 MUCH WORK!!!!!!!!!!!!!! i dont remember the last time i gave my sx a une up and it still runs hard!!!!

 

Mickey Thompson didn't think so.



How muich boost would you use with a 10.25:1 compression ratio? At 3-4 PSI, it needed a water/alcohol mix to run reliably on the pump gas of the day.

The technology showcase and its "one HP per cubic inch" advertising, was intended to lure buyers away from the "entry level" brands.

Norm

 

The fundamental problem with the Jetfire is Oldsmobile's misguided attempt to overcome boost lag by running 10.25:1 compression on a turbo motor.

Even with the fluid injection, the turbo was limited to 5 psi of boost. Modern turbo cars run lower compression and much more boost, which has been proven to be a much more effective solution. As for strength of the 215, as Norm points out, that's not an issue. Even better, the late Rover versions of that block have cross-bolted mains. I have one of those blocks (in 4.6 liter displacement) winging it's way to me right now.

 

off subject so will keep it short --Rover ( and lots of British makes )seem to thieve /purchase from all over .Ex partner had a little 2l turbo diesel rover.Was French--citroen or peugeot --went like a cut cat.
mike

 

i understand about compression and boost, nothing a set of custom forged pistons wouldn't cure. i think it would be fun to get one of those things and build the heck out of it. just didn't know if it'd take it..