I have an 88 IROC with the 305 TPI. According to some sites, if the car came stock with the tach that yellowed at 5000 and redded at 5500, you had the stock hotter cam. This makes the engine top at at 220hp stock. I have since put on an Accel coil, MSD 8.8 Heli-Core wires, Bosch Platinum 4+ plugs, Stage 2 computer chip and 3" pipe from manifolds to a Flowmaster and 4" tips (no cat). I don't want to fry the thing, as it's pushing 165000 miles. Should I avoid the NOS? Paxton says their superchargers will work fine on a stock 305 and are 50 state legal, does this mean it won't hurt it? Also, on ebay there seem to be these electric fans that take the place of the MAF on the TPI cars, and boast a 50hp boost at a flick of a switch, sounds like a big claim for $100!
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Figured I'd ask the pros here before I do something stupid...

 

read this post about those "electric TURDbo's" https://www.thirdgen.org/techbb2/sho...hreadid=143647

 

W/ 165k miles on the bottom end, boosted or sprayed the motor is going to take a beating. I would definately swap those plugs out in either application.

 

i prefer a/c delco rapidfires...

anyway i would not do nitrous! too many miles...
and if you have the money for a supercharger then get a new engine instead...

 

What's wrong with the Bosch?

 

Those 4 ground straps will get very hot and might cause the mixture to explode premature.

DETONATE!!

 

not might the +4's do, the splitefires as well

 

the money for the supercharger could be better spent

IMO, 165,000 miles is a little too much to throw nitrous on an engine..........maybe a small shot of 50 HP of 75 HP........

I say go for some more practical mods to make the car faster.....

 

id go n20.my old setup which was a 305 tpi 100 hp shot worked really good.i wouldnt waste my money on those centifugal superchargers, because they are not positive displacement.

dave

 

165,000 and you want to throw n20 or blower on it. Do yourself a favor and rebuild that thing..you could do a compression test and what not but 165,000 is 165,000..meaning things are not like they use to be. Rebuild that thing then modify it blower or n20 your choice..just build it right the first time then no headaches..just one humble mans opinion....

 

I agree with the rebuild. The key here is to be patient, I think. I never thought i would ever get my car any faster, and I wouldn't if I hadn't kept it. Do the rebuild - you will be happier you did, and for longer! You can even swap in a 383 and blow the doors off some of your supercharged counterparts! Each time you step into it, you won't be scared to death you are about to kill your motor.

 

yeah since either are some of the best fuel pumps money can buy let alone some of the fastest full bodied race cars! dont bother buying that "crap" right? Oh by the way that includes turbos, oh darn!

 

oh im going to buy a centrifugal supercharger cause it has the best fuel pumps that come with it .....SO.i get sold on the dyno numbers and torque curve that is prduced by a "power adder". centrifugal superchargers do not produce a broad torque curve like a positive displacement.oh turbos are the way to go.....i have yet to see a turbo on a top fuel dragster.howabout ihra ,the pro mod class...mostly dominated by roots or whipple superchargers and nitrous.u know why they use it .......cause theres no lag.imo turbos should be left to road courses,grand prix,indy etc.besides with the money ud spend on turbo setup u could of instead invest it in a big displacement motor making the power u want all motor.

dave

 

UM...Yeah, I cant see where any body said that the better fuel pumps "come" with the centrifugal super chargers, but if thats what you think then ... OK....I guess Gee... see that little funny thing about the "no turbos on top fuelers" the IHBA uses top fuel motors, and the turbonetics boat, well it cant be touched by any of the others HP wise, let alone in competition the parasitic losses on roots is kinda high % of HP wise. you should check it out when you look at the outputs of some of the larger centrifugals as well as the efficiency curves it makes you wonder, hmmm howcome they dont use centrifugals, maybe the question should be how come they cant the only arguement for running a roots is really simply cost. its hard to beat a roots based street car in the price department if the scale is kept basic (like the 500 hp range). then again nitrous is the same case

 

The only reason I can think that the top fuel guys dont use centrifigal sc's is the time to make full boost. By the time full boost is reached the other guy is at the lights with the win. Now if you go and stretch the race to a mile I think it might be a different story.

As for racer what about Tony Christensen or Bob Reiger. Both have had amzing success with turbos!

 

I would say, with the 305, don't waste your time or money. The 305 really doesn't have the potential to make it worth modifing, especially one with high miles. Plus, it's poor bore to stroke ratio make it rev handicapped, and centrifugal superchargers and turbos like to go high. On the matter of NO2 with warn stock internals, you're not going to survivie long with enough spray to run with even lightly modded larger engines. I say if you're going to spend in the $3-$4K range on a supercharger, go with a new 350 or 383 longblock, you'll see the same power gains and have much more longevity and potential. I hope that helps.

 

hey Tom, leave the guy alone, hes like me, uneducated in the ways of the supercharger

centrifugals have tons of advantages over roots blower. tons. it just doesnt matter when you dont have to worry about detonation or cylinder pressures. it would be a toss up which to use if the roots blowers werent so much cheaper/easier to build/maintain, and the simple fact they react the second you nail the pedal. But, there are plenty of turbos that do that too...

my point is that unless your strictly using nitro and methanol and running 5 seconds or lower in the 1/4 mile, a centrifugal setup has plenty of advantages over a roots, especially on the street (which is where most of us like to drive our thirdgens).

Oh i could name some. I could say they fit under the stock hood so you dont have to worry about birds/rain/small objects. I could say they are perfect for multi-point style fuel injection manifolds to maintain fuel economy and have the power when you want it. I could say that they run more boost, more efficiently (especially with intercooling) than a roots blower would EVER even THINK of applying to a street engine.

But i wont. Ill leave that to ATI and all the rest of those crazy people who advertise day and night to buy their products. but its true.

Hey, you cant beat the easy cheapness of a roots blower. $2000 and a set of carbs and your 350 chevy is making 600 horsepower. but dont expect the fuel economy to be there, and done expect the stock hood to fit without a huge hole. and dont expect any kind of traction on the street (although thats kinda the fun part). Compare THAT to a 1200 horsepower twin turbo setup that maintains its fuel economy and streetability, and did i mention 1200 horsepower? (can we say "Monty"? can we say "second mortgage"?)

 

I dont know what my problem is on here and other posts you will actually witness me argueing FOR turbos! And I am a Nitrous guy that happens to have a centrifugal?