I just got a 91'Z28 305 TPI auto. I'm thinking about installing a sneaky pete for when I go run it this March. My import friends sorta doubt this 3rd gen 305, and think they don't run much. So I'd like to use it just to fudge my time slightly, until I can put a perfromance engine in the car.

------------------
91'Z28 305 TPI *stock for now*

 

My guess would be a tenth or so. That's a seriously small shot, much better suited to small 4 cylinder engines.

 

I understand a sneaky pete doesn't do much. But thats why I want it. I don't want a 125hp shot, becasue my friends wouldn't beleive I was stock. At Summitracing.com it says it's worth a .1 in the 1/4, but thats a vague number. Going from a 11.0 to a 10.9 takes more HP, than going from a 15.5 to a 15.4, yeah know. That's why I'm just looking for anyone whose used it with a stock 305
Thanks to anyone who can help

------------------
91'Z28 305 TPI *stock for now*

 

why dont you go for the reg. 10 pounder(bottle) and hide it.. like where the spare tires goes? also... its my opinion though, that you shouldnt use nitrous as a 'bandaid' till you get a newer engine.. just dont race your friend, let him remain in ignorance, keep your money till you can get a meaner engine

 

I say go for something bigger.. At least a 125 shot should do nicely. What is great about TPI is that you can very easily hide everything. Like MTX28 said, bigger & hide it.

If you're at the track, they'll never realize you're running nitrous. You'll have more fun by going faster and enjoying the rush you get from pressing the nitrous button.. and you'll have their respect by turning impressive numbers (especially from a ***** standpoint).

Steve

 

Hmmm 125 sounds tempting......but I think they'll know somethings up. They know my car is supposed to be mid 15's stock. I just wanted to pull low 15's or maybee a 14.9 just to be like "I guess those magizines were wrong" My import friends don't hate on V-8's or anything, they're all cool. They just frown on the stock 305's from the 80's to early 90's. But if a sneaky pete wont give me a decent drop in the 1/4 for $200 then forget it.

 

The "sneaky pete" system was designed to allow bracket races a small hit to make up for a bad launch/wheel spin. Its good for about a 10th.

------------------
1992 Pontiac Firebird 350/Six Speed
1987 Toyota Pickup 383/500+ HP

 

See but here we go again. Everyone says a 10th!!! I understand a 10th, but in what time brachet. Does it get you a 10.9 from and 11.00, or does it get you a 15.9 from a 16.00. Becasue the lower time you run the more HP you need to drop another tenth. Whats the hp rating on a sneaky pete?

------------------
91'Z28 305 TPI *stock for now*

 

screw sneaky pete. Hide a small 10 lb setup and run it at 50 or 75 hp if you dont want to cause too much of a rucus......then when you want more nitrous help later (new engine) jet the setup for 125 or 150. that way youre not wasting your money on sneaky lameass pete....which is only good for a tenth ( I cant help myself! sorry).

 

I agree with vortecfcar here. why waste $200 on such a limited system? Add $200 or $300 it and get a better kit. For that kind of money you can get something like the NX TPI kit that includes jets for 50-75 100 and 150 HP levels. You can install larger jets to "fudge it" as you do other things like air box mods & tuning. When/if you do get around to building a new engine you can still use a larger kit on it. You can even add a second stage on the NX kit with an add-on kit they have.
Also if you're worried about it going too fast with the nitrous just hit it later in the run.

It is hard to put exact numbers for gain in hp or time on the SP system if they are still making them the way the used too. I haven't seen one of those kits in person in years, but they were (are?) a kit with only a nitrous solenoid and nozzle but no fuel solenoid, fuel nozzle or other fuel enrichment device. You have to run a little rich all the time when off nitrous to have the right air/fuel mix on nitrous. With a carb you run a couple sizes larger secondary jets. On a TPI you would need to bump up fuel pressure.
Your final air/fuel mix will determine your actual HP output.
It would be pretty small with such a kit, a reasonable guess would be 10-25 hp.


------------------

Tracy /AKA IROCKZ4me
'86 IROC-Z Camaro

• 355 cid
• AFR heads
• Arizona Speed & Marine hydraulic roller cam w/ AFR hydra-rev kit
• modified SLP runners
• TRW forged pistons/ceramic coated
• fully balanced
• Edelbrock headers/ceramic coated
• SLP cat-back
• Paxton supercharger
• Nitrous Express nitrous oxide

My IROC-Z
EFI Performance Club on Yahoo
Club IROC-Z

 

Thanks for the great suggestion about the jets, it never even occured to me. The sneaky pete definitly isn't worth the $200 if all it's going to give me is 10-20hp
Thanks again man!!!

------------------
91'Z28 305 TPI *stock for now*

 

First of all, I understand what you mean. On your car 20 hp would knock off a few tenths, thus probably making it worth it.

------------------
Justin 87 GTA--organizer: "NY2K" Gathering. Blk/Gld w/Superam, 355cid Trickflows, forged pistons 9.5:1. Auto 2,600 stall, 3.45 9 bolt disc, Best time & mph 13.567 @ 101.900 w/ a poor 60ft. Best mph: 104.3 *This car is 100% NYS emissions legal, w/ all emissions controls!* "If you want to have a fast car, hang out w/ those who do!"
http:// www.community.webtv.net/munks87/JustinsGTApage.com

 

first of all a sneaky pete is a decent idea for a small gain considering the size, heck you could put a false bottom in your console and stick it under that, anyways check ebay, they go alot cheaper than 200 that would def. make it worth it. Plus on a stock engine you might not wanna push even a 50 shot.

 

I think he's already made a decision in the 49 months since this was originally posted.

 

that is true

 

I heard since he first posted this Q his kid is now 4 so he's decided to just wait and give the car to him in 12 more years.

 

Accually since I posted this last I have died and came back as a cat in my new life

Sike accually I sold the 86 and got a 91 now that is bone stock and probably will stay that way. But thx for the reply!