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3rd Generation Camaros 1982-1992 Camaros

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Old 05-24-2011, 09:30 AM   #1
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Tuned port injection good or bad

i have 87 iroc with the tpi 305 and auto with 3.23 rear gears. i was wondering why they droped the tpi set up for tbi
alsio, i have not even had my car out for a spin yet since i got it and everyone says these 305 are dogs but then someone says they are good and yes i would rather have a 350 and 3.73 gears but i don't and i won't be changing anything unless they they become unrepairable, as my car is all original except the stereo. is my car going to be able to put its tail lights in front of mustang?
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Old 05-24-2011, 12:39 PM   #2
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The TPI setup stayed around, it wasn't dropped. The 305 TBI was available but the top dog motors were the LB9 305 TPI and the L98 350 TPI.

Judged within the context of its time, the TPI was a good setup. Nowadays the LTx and LSx series of motors have surpassed and then some the capabilities of the TPI. That being said, a TPI motor has a unique look and feel.

As far as performance... well, thirdgens are all over the place. Option one right and you have a mid to low 14-second car (good for the 87-92 era). Make one or two mistakes on the option block and that car could drop to a mid 15-second car. A lot of people checked the motor box and forgot to check the appropriate gears or suspension to go with it. It's not as easy as the fifthgen where you can say, "Give me the SS," and you have about all the speed you can get.
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Old 05-24-2011, 01:51 PM   #3
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Good low end, but it runs out of steam at higher RPMS. Former Formula 350 owner here.
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Old 05-24-2011, 06:51 PM   #4
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ok, so i know i have the LB9 motor is there anyway to find out what cam it has without opening the motor?
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Old 05-24-2011, 08:24 PM   #5
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thanks, i am really looking forward to my second and third ride in it, as the first ride will a little timid to get a feel for it before i start driving it like it was meant to be driven
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Old 05-25-2011, 02:30 AM   #6
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Probably won't show many fox or better mustangs the tail lights unless its an 8th mile maybe, but they have enough grunt to be fun to drive.
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Old 05-25-2011, 11:49 AM   #7
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I WILL HAVE FUN WITH IT FOR SURE, I REALLY WANTED IT FOR ITS RAIL LIKE HANDELING ANYWAY
THANKS
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Old 05-25-2011, 11:47 PM   #8
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It also depended on what year it was,They changed cam specs from year to year.
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Old 05-28-2011, 10:23 PM   #9
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The old TPI polished up in my opinion is the best looking intake ever... and most of the technology is still in the new LS* motors, just redesigned with newer technology.
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Old 06-02-2011, 01:06 AM   #10
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The TPI setups can be a little tempermental, but all in all, still a desirable setup.
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Old 06-02-2011, 01:12 AM   #11
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I had an '85 and a '89 with the TPI motors, the '89 had the 350 and those were the best cars back then. I miss my IROC-Zs, they handled well and were fast compared to the low horsepower ratings compared to what we get today. My '85 Vette also had the 5.7 TPI motor and it was also a solid runner back in the day.
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Old 06-06-2011, 05:29 PM   #12
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I love the LB9 T5 combo with the 3.42 posi rear. It's a blast to drive and feels way quicker than 230hp / 300lb ft tq would suggest.
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Old 08-05-2011, 07:30 AM   #13
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Now I'm not sure on the 87 iroc but on the 86 iroc if you redline is at 5000 rpm you have the factory small cam and if the redline is at 5500 you got the factory little bit bigger cam.
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Old 08-05-2011, 08:27 AM   #14
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i had two 350 TPI's, and i loved the feel of them. I did have to replace 4 injectors at fairly low miles on one.
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Old 08-05-2011, 09:15 PM   #15
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I run a 305TPI with a ZZ4 cam and springs, FIRST intake, 305 TFS heads, 4th gen alum. driveshaft, 3.42 gears and auburn diff.

Feels great with the new chip. I was told switching to the Comp Cams beehive springs would add 500rpm to the top end.
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Old 08-20-2011, 07:29 PM   #16
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Guys keep in mind that there were some other differences between the '85 LB9 auto with 3.42s and the '87 LB9 5 speed cars with 3.08s or 3.45s. While both were rated at 215hp. The '87s had roller lifters and the 1 piece rear main seal.
I think if you dyno'd them both the '87 would have a couple more hp plus better mileage.

I checked all the "right" boxes on mine.
LB9, 5speed, 3.45 limited slip Australian 9 bolt, 4 wheel discs, engine oil cooler, custom cloth seats, A/C, no power windoows or door locks, not ttops, bright blue metallic- it was gorgeous.

Even though the redline was moved up to 5500 rpms with the "big" cam, it fell on it's face at 4800 rpms.
Car had so much low end torque that I could put it in 5th(.63) overdrive at 25mph and take my foot off the gas and it will roll down the street at idle!!!!! No clunking, no driveline snatch just smoothly down the street for as long as I wanted it to .

EDIT: '85 215hp LB9 had 275 tq. '87 215hp version had 295 tq.
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Old 08-20-2011, 07:30 PM   #17
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'86 IROC only came in a auto 190hp version. And had the CHMSL mounted on top of the rear glass hatch.
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Old 08-20-2011, 08:16 PM   #18
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Okay so I'm going to give you my best impression of the TPI (mostly the L98 car) from experience, working on them and driving them.

1.) The TPI is a torque monster, pure and simple. Learn to control that torque on the street, it's too easy to be noticed and maybe get a ticket too. TPI was really designed for 305's back then but GM was lazy and put it on a 350 too. Don't get me wrong though, the L98's are great with a TPI set-up, just not as much stock.

2.) Alot of what helps TPI's get off and going even in the mid-upper RPM's is gearing and suspension work. Alot of cars back then got those 10 bolt 2:73's or 9 bolt 2:77's and I absolutely despise those gears on a 350. All it's good for is slightly better gas mileage than let's say if you put in a performance 9 bolt like the G92 3:27 POSI or a set of 3:42's or 3:70's (all 9 bolt I believe). So gearing is very important and TPI's like that.

3.) Compared to today's advanced engines, TPI's are still great engines to have and work with. They're also abit easier to deal with and on MAF cars you can put more power into the car without having to do alot of tuning vs. a speed density car. They're less tolerant of power mods without any real tuning involved. MAP cars were around from 1990-1992 I believe.

4.) Parts are cheaper, most of the work done on a 3rd Gen. with TPI are easier to do and there's alot of room in the engine bay if it's gutted out.

These are a few pointers for you. Take from it what you will. A properly modified TPI can really get into making power in the 5,500RPM ranges and it's alot of fun when you can. Stock TPI's depending on year ran out of breath anywhere from 4,200-4,600RPM's. The best intake I've seen on them are Holley Stealth Ram's which allow it to easily breathe into the 6kRPM range and still have most of your bottom torque and more horsepower across the band and into the upper area.
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Old 10-14-2011, 06:42 PM   #19
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Quote:
Originally Posted by Camaroirocz View Post
Okay so I'm going to give you my best impression of the TPI (mostly the L98 car) from experience, working on them and driving them.

1.) The TPI is a torque monster, pure and simple. Learn to control that torque on the street, it's too easy to be noticed and maybe get a ticket too. TPI was really designed for 305's back then but GM was lazy and put it on a 350 too. Don't get me wrong though, the L98's are great with a TPI set-up, just not as much stock.

2.) Alot of what helps TPI's get off and going even in the mid-upper RPM's is gearing and suspension work. Alot of cars back then got those 10 bolt 2:73's or 9 bolt 2:77's and I absolutely despise those gears on a 350. All it's good for is slightly better gas mileage than let's say if you put in a performance 9 bolt like the G92 3:27 POSI or a set of 3:42's or 3:70's (all 9 bolt I believe). So gearing is very important and TPI's like that.

3.) Compared to today's advanced engines, TPI's are still great engines to have and work with. They're also abit easier to deal with and on MAF cars you can put more power into the car without having to do alot of tuning vs. a speed density car. They're less tolerant of power mods without any real tuning involved. MAP cars were around from 1990-1992 I believe.

4.) Parts are cheaper, most of the work done on a 3rd Gen. with TPI are easier to do and there's alot of room in the engine bay if it's gutted out.

These are a few pointers for you. Take from it what you will. A properly modified TPI can really get into making power in the 5,500RPM ranges and it's alot of fun when you can. Stock TPI's depending on year ran out of breath anywhere from 4,200-4,600RPM's. The best intake I've seen on them are Holley Stealth Ram's which allow it to easily breathe into the 6kRPM range and still have most of your bottom torque and more horsepower across the band and into the upper area.
I agree with most of what you said but typically you don't want to give them a lot of gear. They fall on their face at 4800 rpms. 3.70s were not available from the factory. Topped out at 3.45s. I've heard of people putting 4.10s in them and they just run out of gear.
And they have so much low end tq that there is really no reason to go there.

Also what you said is tru about the 350s. They max out at even less rpms. I know in IMSA SS they shifted at 4400 rpms.
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Old 10-14-2011, 08:46 PM   #20
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I owned several Camaros in this era (not including my 1969), from a 1982 six-banger (107 bhp, yup!), 180 hp HO (late 80's), 1990 and 1991 IROC-Z 5.7 TPI (245 bhp). I have to say I liked my HO the best for overall performance; the 5.7 liter did "fall on its face" in the upper RPM range. I currently own a 1989 Camaro RS but this car has been seriously modified with a carbureted setup. It seems you are happy with your package and, if so, I would do some of the simple mods mentioned here and enjoy your ride!

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Old 10-15-2011, 11:48 PM   #21
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Quote:
Originally Posted by b4z View Post
I agree with most of what you said but typically you don't want to give them a lot of gear. They fall on their face at 4800 rpms. 3.70s were not available from the factory. Topped out at 3.45s. I've heard of people putting 4.10s in them and they just run out of gear.
And they have so much low end tq that there is really no reason to go there.

Also what you said is tru about the 350s. They max out at even less rpms. I know in IMSA SS they shifted at 4400 rpms.
A stock TPI will fall flat on it's face at around 4,500-4,800 RPM's, yes. I wouldn't even really say as high as 4,800 RPM because that's alot of RPM for a street car honestly. TPI is best from 2,000-4,500 stock. There are 3:70 gears available for a 9 bolt on Ebay and on another website that sells rare and hard to find parts for 9 bolts. 3:70's would be as low a gear that I'd go on a TPI stock or built. 4:10's or 4:11's are too deep a gear for it unless it had a HSR system or LS1.
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