Tbi Vs. Tpi

I see there is a urge to discuss the different engines from camaros. What do you guys think? I know people who swear by both and I have a buddy that put tbi from a camaro in his truck and it runs great. But whats everyone elses opinion?

Ohh I see, so this thread isn't for me right?? LOL

well what do you think?

small world huh

Sure is, that looks to me like throttle body injection. I hear that gets off the in faster than a tuned port.

Sure is, that looks to me like throttle body injection. I hear that gets off the in faster than a tuned port.
lots of variables that come into play there, not just the fact it's tbi

bah....

both have their purposes pro's and con's nuff said on my part... :2cents:

What advantage does TBI have other than being more simple? I have always wondered why GM never installed the TPI on trucks since it makes so much more torque than TBI. I have thought about converting my 87 TBI Suburban to TPI but I don't know if it's worth the hassle.

Its cheapier than TPI for one.
uummm..... well crap ok 1992RS can join in on the TBI pro's I am not a fan of them but he seems to know some stuff.

TPI is sweet but on a 350 it falls on its face at 5200rpms. So if you were to go TPI I would pick up a holler stealth Ram intake manifold. If its on a 350 it will really breath!!!

while we are on the subject , hopfully ill get my 350 longblock to rebuild and im wondering if i should stay with a carb setup or go to TPI , i have never owned a TPI car what are some pro and cons? whats YOUR oppinions?

tbi isn't really any more simple than tpi. only difference-8 injectors instead of 2, and the location, that and all tbi uses speed density instead of maf. which 90 and up tp is speed density too. while some would argue that the injectors being closer to the valves creates more power i think it's just quicker throttle response, but i think the what really sets them apart power wise is the tuned runners.

tbi sucks i should know i like to smack them with hammers.
tpi sucks alittle less. it's all a verying scale of suckiness. carbs dont suck but your injection sucks.
and that motor right up there looks like a stock piece of shit. wow i have yellow gay accel wires look at me wow. and cheapy headers whoooo im impressed and look i painted it chevy orange wowsers. and look at the pretty painted manifold i should be in the low 15's now. like me like me!

tbi sucks i should know i like to smack them with hammers.
tpi sucks alittle less. it's all a verying scale of suckiness. carbs dont suck but your injection sucks.
and that motor right up there looks like a stock piece of shit. wow i have yellow gay accel wires look at me wow. and cheapy headers whoooo im impressed and look i painted it chevy orange wowsers. and look at the pretty painted manifold i should be in the low 15's now. like me like me!

go back to flippin burgers with the dream that someday you'll own a car instead of riding the city bus you bag of shit

tbi sucks i should know i like to smack them with hammers.
tpi sucks alittle less. it's all a verying scale of suckiness. carbs dont suck but your injection sucks.
and that motor right up there looks like a stock piece of shit. wow i have yellow gay accel wires look at me wow. and cheapy headers whoooo im impressed and look i painted it chevy orange wowsers. and look at the pretty painted manifold i should be in the low 15's now. like me like me!

wtf is ur problem?

oh ya, and if you had any brains at all you'd notice that it's got LO9 valve covers, but yet the dipstick is on the drivers side. kinda tells ya one thing...the heads arent original nor is the block. just cause there painted orange doesn't mean there stock heads

tru that, that thing looks beefy. owned.

well, TBI is a good intake, and when you use the propor parts, it has higher rpm potential than a standard TPI setup, owning both i would have to say that TPI has the TBI owned however, better throttle responce, better low end torque, better off the line, better gas mileage (by far, and the TPI is a 350 while TBI is a 305, with 30,000 miles on the TBI vs 150,000 miles on the TPI) the TBI was kinda the bastard child of carburators and port fuel injection. the stock setup is pretty weak, but they have potential. but i personally swear by TPI for its overal driveabliity and power, also there are intakes, the Holly stealth ram for one, like twin89s said, and the accel superram intake which i prefer. the superram extends the powerband of the TPI up to around 6500rpm. dunno bout the holley intake.

my turn my turn my turn...LOL Stock TBI sucks monkey nuts, but with some mods it isn't all that bad. It costs some money, but what doesn't. With the right parts, you can safely spin your engine to 6500rpm. Now the reason, I believe, that tpi drops out so fast is simple, you have 8 injectors that must be presisely timed to spit. Now at higher rpms there is much less room for errer. It's computer controlled, now if the injectors could be run off of the distributor I think it would have much more potential..that's just what I think. Anyway, Induction is only a small part of what makes an engine go. And honestly should be the last thing you think about when building an engine. It should not be concidered when planing the layout of the motor at all. If you want some seriouse power, build an engine that'll scream. After that decide on an induction.

tbi sucks i should know i like to smack them with hammers.
tpi sucks alittle less. it's all a verying scale of suckiness. carbs dont suck but your injection sucks.
and that motor right up there looks like a stock piece of shit. wow i have yellow gay accel wires look at me wow. and cheapy headers whoooo im impressed and look i painted it chevy orange wowsers. and look at the pretty painted manifold i should be in the low 15's now. like me like me!

Wow, what's HIS problem?

without a doubt your right, in fact i'd have tpi sitting under my hood if i had the money, but i just plain dont. and, i hate it when people bad mouth something that clearly has potential like tbi, which is why i decided to dump the quardrajet and go EFI. not to mention the engine in my sig is soon to be my daily driver so with a 4bbl carb and the gas prices the way they are, i decided to try something different.

actually the limiting factor on the tpi rpm potential is the lenth of the runners, its the harmonic wave principle. longer runners promote higher airflow at low rpms, while shorter runners provide more flow at high rpms. the accuracy of the injectors are not that big of a deal because tpi is not a sequential fuel injection system, it is batch fire. meaning that all four on the left fire at the same time, and all four on the right fire at the same time. rather than each injector firing at its own interval. not being a dick, just explaining ;)

Ok, now that makes absolutly no since to me. Not calling you out Iroc, just doesn't make since. So the gas that isn't needed at that time just sits there?? WTF!!! It would make more since if it was sequential. Oh well.

I believe TPI has more potential but only due to aftermarket intakes.
TBI is a lot simpler I think... Less wiring less parts. Really its more reliable just because of that! Less parts! lol

But stock vs stock TPI will win everytime in practically every department.

well thats why LT1 engines and later are sequential, gotta remember that TPI was gm's first port injection setup, they were still fine tuning it, TBI fires both injectors constantly, so the batchfire system is better than that if you think about it, then someone found out how to fire each one individually and they went to that, just a natural progression. im not sure exactly how the batchfire dosnt pool up fuel, i think it has something to do with the harmonic, and the heat from the valve, keeps the mixture vaporized enough to burn cleanly, rather than just pooling in the cylender when the valve opens.

Yes, in the TBI they both fire at the same time, but there not sitting on top of there own cylinder either.

funkmasterflex needs to shut up or atleast banned. This was a perfectly good thread untill he had to run his big mouth. Now this was a perfectly good thread untill that big mouth started running his little trap. I bet he has problems in bed IMO. But anyway, throttle body injection is a perfectly good set up. It gives you more room for play like putting a bigger cam in it. It is still a simpler set up than a tuned port injection engine and it can hold its own. People need to stop giving the tbi crap. Thats like getting suspended for pissing outside in an enclosed area where nobodies at orelse your going to wet your pants. Some people are just retarded!

uummm... you can run very large cams on TPI too....

You can, but you have to go threw the trouble of changing crap in the prom. In TBI all you have to do is slide the old one out and slide in the new one.

Nope no prom changes needed. Me and V8punk already put a cam and other shit on his 89 Iroc 350 TPI... Stock chip worked fine.

Unless it was a stock cam you dont know what you are talking about. There is a cam sensor on tuned ports that let the engine know what the cam is reading and a tuned port wont work unless it gets correct info back from that sensor about that cam.

I know what i am talking about. It works perfectly fine! Car gets sideways nicely in 2nd and its a damn th700r4 tranny!
car idles ok despite the aggressiveness of the cam. It works fine. And there was no cam sensor on this car. you might be thinking of OBDII Lt1's and LS1's. This is on an 89 IROC. heads cam HSR longtubes etc...

ya there's no cam sensor in tuned port. as for the prom thing, it wouldn't be a bad idea to have a new one burned to match ur engine vacuum with the new cam and adjust timing advance. but other than that it's fine. and how many times must i say this TPI IS NO MORE COMPLEX THEN TBI! i've worked on both. in fact on a speed density tuned port you could swap in a tbi set up if it werent for there being 8 injectors instead of 2 and a higher pres. fuel pump. almost the same harness and exact same sensors, dist, coil, and the list goes on. the only tpi that makes it difficult to service is the MAF tp. really no way to check the MAF and usually doesn't give any trouble codes from the ecm when it's faulty.

Unless it was a stock cam you dont know what you are talking about. There is a cam sensor on tuned ports that let the engine know what the cam is reading and a tuned port wont work unless it gets correct info back from that sensor about that cam.

Well thats a complete load of crap. Completely and totally false. You shouldn't let your fingers start typing if you don't know your information.

It is still on the stock computer but he ordered a chip from pcmforless I am told now.