I have a 1991 camaro 305 and wanted to to get Thumpr Comp cam. I was dicussing with a friend he said if I were to get it it would mess up my map sensory. I know if i change the cam I will need to change the valve spring, lifters, push rods and and seals and stuff. But if there is another cam with a 104- 108 lobe seperation please let me know, I prefer the choppy idle. Any know who has done this let me know

 

Not going to happen with tbi with that low lsa will run like dew dew. Will be impossible to tune too.

 

I know someone that had a 110 lsa in a tbi350 ran great!had alot of mods to ran a 13.84 in the 1/4 at exactly 99mph.

 

What if I were to go to the junk and find a 305 tpi and take the prom chip out of it along with the harness and etc then get the cam will that even help a cause. Should i invest in a different throttle body first.Open to hear GOOD suggestions

 

Good suggestion: Do not attempt to use a cam with 104-108*LCA in your engine.

110-114* will be fine.

 

Just on what you are asking, I suggest you through all the very informative stickies in the tbi section. Very helpful!! I don't post a lot because i search a lot and have all my questions answered. This question has been argued over quite a few times.
On that note: LT1 cam or even Comps Xtreme EnergyXE268H-10 would give you good response without breaking the bank.. All that choppy idle causes a lot of vac changes and will require tons of tuning also.. Look into EBL flashing..

 

I had a friend put an aggressive cam in his car because he wanted that muscle car/drag car chop, but after a month he pulled it back out. Mainly due to the fact that it messed up so much stuff it actually reduced his HP. car sounded good but was in the end gutless. He then not only had the chevy guys laughing at him but he also had his own Ford crowd laughing at him too.

I just smiled and told him he can do anything he wants to his car.

 

This is true as long as the duration is low enough. For instance the stock L03 cam has a 109 LSA.

 

This chip is different than your TBI chip in most aspects. This will not work. Best for you to grab yourself a cheap used LT1 camshaft and do the proper tuning required to make it run right.

If you haven't done a full exhaust with headers back, start there first.

 

Okay thanks for the good info but what if did the same tpi set up I wanted and get a Xtreme Energy™, XR288HR camshaft by Comp cam will that be good or try something else. or the Xtreme Energy™http://www.summitracing.com/parts/CCA-CL12-242-2/

 

That's a flat tappet cam - your 305 is using a roller camshaft. Switching to a flat tappet cam require different lifters and longer length pushrods vs. what you have right now. This comp cam camshaft is NOT suitable for a stock, low compression 305. Way too much duration at 050 lift is 224/230 (int/exh) with 477/480 lift - you can kiss low end torque goodbuy. With LSA of 110 deg your engine will have hard time idling (if at all). Stock valve springs will be overtaxed with cam - reworking heads for higher lift will be required. Your best bet for a drivable combination is to find a used LT1 from 4th gen as it is a much better choice for a computer controlled engines TBI or TPI. There are numerous 3rd gens 305 with LT1 cam - there should be videos on Youtube. The XR288HR comp cam is best used for 350 with min 9.5:CR and a carburetor.

//RF

 

Just really curious about finding out drivers license nxt week.All right will the lt1 cam have a different idle but it not ive heard of a controlled cam by sme brands or how about a lt4 cam

 

Production LT4 cam will idle like a stock 305.

http://www.youtube.com/watch?v=qIiKp8llEec

 

I'm running basically a baby ZZ4 in my 88 and it runs great. ZZ4 heads and cam REALLY wake up a 305 TBI. It really wasn't that much of a bitch to tune in either. Just read my cardomain for most of the answers you're looking for.....

 

Wow, thanks but I'm leaning toward a LT4 hot cam with a TPI 305 set up, changing it from a TBI( including mainfolds, harness, valve sprigs and etc.) though since Im also thinking about changing the heads to ported TPI's. What about the computer will I need to get a performance chip or will a 305 TPI chip fit a TBI 305 ecm without a problem.
Also, if possible send some more info to my email, beaballplayer234@gmail.com

 

Ok let me get this out of the way before someone else does.....NONONONONONNNONONONNONONONONO!!!!!!!!!!!!!!!!!! You DON"T need to change to TPI to make power!!!! TRUST ME WHEN I SAY THIS. With The hotcam your TPI system IS going to run out of steam before you can really make use of it's true powerband. Just stick to TBI, get a good carb manifold with an adapter plate. a good set of heads and the cam of your choice....just be prepared to tune the damn thing. You'll spend ALOT more to get good numbers out of TPI when is far CHEAPER to get them with TBI. I KNOW this from experience. I have BOTH systems. TBI on my 88 and a TPI 5.7 in my 91 and I'm going to rip off the TPI in favor of a Stealth Ram if that tells you anything. My TBI car runs circles around my TPI car and thats pretty damn sad if you ask me.

 

okay will the 7101 Edelbrock RPM intake be able to hold and work with the sensorys don't want annoying codes popping up. Can I still get the TPI ported heads with the LT4 hot cam in my TBI 305.(Of course with lifters, springs, and etc)FAir set up or can it be improved.

 

Yes it will work just fine. It has most of the hook ups for your sensors except for the EGR. Just get the adapter plate I mentioned on my cardomain. The heads and hotcam will work as well although I recommend a good torque converter if you're running an auto. The stocker will not
cut it. As for the TBI unit just do the ultimate TBI mods with an AFPR and you're good to go on that side of it.

 

Hey rob, what have you done with your bottom end thus far? Definitely off-topic but I thought I'd ask anyway

 

Not a damn thing, its a bone stock L03 bottom end. I got lucky when I bought the car almost 9 years ago that the engine had barely 20k on is as it was replaced with a brand new sdpc longblock. The only difference from a stock block was sdpc uses LS7 lifters in all of there factory replacements.

 

Def dont switch to TPI! more parts harder too work on and RPM limited. If you dont plan on swapping the heads you will be limited by the amount of lift the heads will support and the LSA that the computer will have trouble idling at. read my mods and you will get some ideas.

 

You forgot to post your sig so here it is:


Iggy's running a single plane and I have one coming in for my TBI setup. Fast355 did a comparison between TBI (single plane manifold IIRC) and TPI a few years ago and the difference was so slight that it's not worth it- the TBI was actually a little better on the lower end.

 

you cant run a tpi chip in a tbi computer and vice versa

 

plus headers.the 305 manifolds suck.tpi manifolds are a little better.

 

On the 350 they are, but I seriously doubt the 305 TPI has better manifolds than the 305 TBI.

 

That is plain wrong!
Late TPI uses 1227730 ECM ($8d mask) while typical car TBI uses 1228746 ECM ($61 mask) - the two EPROM have different contents.

//RF

 

The base TPI 305 cars had the very same manifolds as the TBI. The G-92 cars with dual cats had the larger L98 manifolds.

 

I think its actually the TBI Y-pipe that is so atrocious. The TBI piece is just a piece of crap and the TPI pipe actually has a little engineering in it.

Running a "hot" cam in a TBI engine seems to be all about tuning. I start off my TBI endeavors in the fuel tank. Those stock TBI fuel pumps are so terrible and inconsistent that they cannot be trusted. I always use a late model vortec fuel pump, which I usually get off of eBay for pretty cheap. The same pump that spec'd for the 1989 Turbo Trans Am is also the one that GM used in the VIN code R 350 Vortech engines in pickup trucks and suburbans. Its a little noisy, but it seems to flow enough fuel for up to 400HP or so.

Once you have that little detail taken care of, you can start with your cam endeavors. Otherwise, you won't be ready to take advantage of what the cam will bring.

The rest is tuning.

Have fun!

 

i agree about the pump as well. I'm running an ACDelco TPI pump and it works great. As for the Hotcam it could be pretty tough for a beginner to tune in. I'm actually toying around with pulling out my ZZ4 cam in favor of one due to the fact it wouldn't take to much for me to get it right.

 

oh i think what i said is right,read it again.

 

Are you running the EBL system? I was thinking that with a laptop and an EBL I could probably tune it in pretty well!

Its on my list for the 89 TBI bird that I have. I'm on an extreme budget, so I did the fuel pump first, then the muffler, and next on the list is the headers and y-pipe. Once I have the exhaust lined out, its gonna be time for that cam and some tuning. Of course, I have to stack up all the necessary parts to get that done, including the EBL, ultimate TBI mods, and a 454 TBI unit... maybe some vortec heads... maybe hog out the intake...

 

Yes i am running the EBL Flash and it's awesome. Coolest thing since sliced bread,lol.