i have an 87 camaro with a 305 tpi
it has fastburn heads
shorty headers
it has a comp nitrous cam
with intake lift at .502
and exhaust lift at .512
duration is 224,236 at .050
and 113 lobe seperation
3.73 gear
2,200 stall converter
shift kit
flowmaster muffler
timing advanced to 8 degrees
i have just gotten done
installing the headers,cam
and heads and the car started
and sounded ruthless, but when
I took it out and drove it, it
was a dog. it felt slower than
it was before.
i am going to get a chip for it
in a week, will this improve it?
also is the timing off or
is the cam too radical?

thanks in advance
kyle

 

what is the car doing? does it bogg? what size injectors? got a AFPR?

------------------
Brandon
"ScreaminDeamin 360"
350 60 over, TRW forged 9.83:1 pistons,Hooker Comp headers, crane cam 216/228 .484/.512, crane 1.6 RR's, ported plenum, home made ram air, 24lb SVO injectors, crane AFPR, all going through 3 inch mandrel pipe and a flowmaster.
New project-89 IROC-Jamex Springs...and thats just about it till summer!
Soon- 6 speed, Pro 5.0 shifter and 4.10's
http://users.argolink.net/bvana

http://ScreaminDeamin.cz28.com

 

it is not bogging it just doesnt really go
i have an afprnit is set at 44 and
i have stock injectors.

 

thats a pretty good sized cam for a 305. have you tired a higher press with the fuel?i thought stock seting was like 45psi or something like that.

------------------
Brandon
"ScreaminDeamin 360"
350 60 over, TRW forged 9.83:1 pistons,Hooker Comp headers, crane cam 216/228 .484/.512, crane 1.6 RR's, ported plenum, home made ram air, 24lb SVO injectors, crane AFPR, all going through 3 inch mandrel pipe and a flowmaster.
New project-89 IROC-Jamex Springs...and thats just about it till summer!
Soon- 6 speed, Pro 5.0 shifter and 4.10's
http://users.argolink.net/bvana

http://ScreaminDeamin.cz28.com

 

My guess is timing. 8 sounds a little week, try 12 (stock, isn't it?) or 14. BTDC.

-Reno

------------------
89 Formula

 

Stock is 42..bumping Fuel Pressure doesn't seem to help much on the 305 TPI's unless you have larger injectors or a custom PROM. I have mine set to stock, which is 42, because it seems to run best at that. Also, stock ignition timing is 6*..12* is getting a little ballzy..

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

• Red '88 IROC 5 Speed 305 TPI w/3.08
• Dual Friction Stage III Centerforce Clutch
• Accel 300+ Racing Ignition
• Accel 300+ Pro Sleeve Plug Wires
• AC Delco Rapid Fire Plugs
• Flowmaster Force II 3 Chamber Cat Back Exhaust
• Hypertech Chip
• Hypertech Airfoil
• Gutted Air Box
• Best Maryland (40 degrees) E/T 14.686, 60' 2.205, 1/8th mile 9.461, 1/4 mile MPH 93.91
• Best Florida (80 degrees) E/T 14.88, 60' 2.163, 1/8th mile 9.540, 1/4 mile MPH 92.74
• Best 60' 2.163(Florida)
• TPiS AFPR set to 42psi using Accel Fuel Pressure Gauge (Installed after Maryland run)
• Aluminum Driveshaft (Installed after Maryland run)

 

I would say that you deffinatley are in need of a custom prom, especially considering that cam and heads. Head over to the prom board and read the tech article, it's a lot easier than you would think and it's cheaper to buy the equipment and do it right than it would be to buy a "custom" prom.

I agree that cam seems a little large which NEEDS some changes to the prom to run correctly. By the way how did you get the dastburn heads to mate with your TPI base, aren't they the same style as the vortec heads ie, tall skinney intake ports?

 

i will be upgrading the injectors after i get some money to buy them. i am getting the chip this week so hopefully that will help .
what we did with the intake was had aluminum welded onto the top of the intake ports and then it was milled down. then the ports were ported out to match the fastburn heads and we wobbled out the bolt holes. i didnt want to wait for scoggin dickey because i just called them and they delayed their intake another month, i dont think theyll ever get it done.

 

What kind of power are you expecting from the 305 after the mods?

 

Sounds like you need more fuel. Get it dyno tuned to see what is going on. You may need larger injectors and some PROM tuning. Also, did you have the heads milled down to 58 cc?

------------------
1988 GTA 5.7L TPI Auto
355 ci. block,TPIS ZZ-9 Camshaft, SLP Headers, Borla Cat Back, B&M Holeshot 2400 Stall Converter, 3.73 Richmond Gears

"Why ride a stang when birds can fly?"

http://www.geocities.com/thegta

 

I can see several problems:

1. Fast burn heads have a 62cc combustion chambers which would put you at 9.0:1 compression which is to low for that cam.
2. Fast Burn heads have a 210cc intake runner which is way to big for a 305.
3. Your cam selection is a little big for a 305.
4. You did not mention any induction mods???
5. You do not need a custom chip to make this combination work, you need more cubis inches. A 350 would work but a 383 would match the heads better.

 

That cam sounds way too big for a 305. It's going to be especially bad with a TPI on top of the engine. I've got a 355 with the hotcam (duration 218/228) which isn't even as much as your cam, and it runs rough without having a custom chip. The TPI also chokes the hell out of it past 5000 rpms; your cam has an even higher powerband so it'll be worse. But having a TPI setup with your cam is only adding to the problem of having too small of an engine for that head/cam combo. That cam needs a miniram/superram intake, also. Like Fmsracing said, I'd look into getting a new or used 350 short block and swapping your goodies onto it, you'll be much happier. Also, if you can afford it, get a stroker kit for that 350, it will help even more.

 

i am expecting the car to have a bit more power and it seems to have less.
the heads were milled down to 58cc and we used the thinnest gasket on them
the only induction that was done was the ports on the intake were matched to the heads and the plenum and runners were ported
i do not have the funds for a different motor i only have about 60 dollars for a chip

 

Seriously, those guys are right, your combo is set up to make mondo top end power, but no doubt it is a slug off the line. With smaller heads that cam wouldn't be so bad, but those heads are huge for a 305.
Your best bet if you have no money is to pick up the cheapest carb set-up you can get your hands on, which sucks cuz good luck finding used vortec pattern carb intakes cheaply. But that would be your only hope of making it run right without a completely upgraded TPI and chip. With a nice carb intake on it i'd bet that thing would sing to 7k.
...ed

------------------
Ed Maher - Moderator @ The Carb Board
92 Z28 Convertible - Quasar blue / Tan top
LB9 4L60 GU2 G80 - stock, soon to be sleeper
-=ICON Motorsports=-

- Definitely prototypes, high powered mutants of some kind. Too weird to live, too cool to die

 

I agree, the cam is off for a tpi. The lift is good but the duration is waay too much. I don't think the cam will work well with a tpi no matter what heads you have on it; the tpi just won't support the rpm the cam wants-even seriously modified.
I would do what the others said and either change out some parts or look for an engine that can use that stuff.
60 bux aint gonna solve your problem, I can't even think of a chip that costs that little. Good luck though!

------------------
'88 RS (originally 2.8)
-350, .040 over, vette alum. L98s, stock tpi.
-305 injectors & chip
-TES headers & edelbrock cat back
-3.73 gears, 700r4.
Best with 2.8-17.4@77mph
Best with 305-15.0@93mph
Best with 356-13.7@101mph
on a 2.050 60 ft.
(Damn the 2.8!)

 

Im wondering how you got fastburn heads to work on a 305?? No one else picked this up? That must of been hard notching the bores while the motor was in the car??

 

I picked that up 87, but i let it slide. Reason being, anybody smart enough to describe how to make a regular SBC intake work on vortec heads is hopefully smart enough to check for valve/bore clearance issues. Not all big valve heads have interference problems, in fact, i think most really don't. They're undesireable because of the shrouding of the valves, but i think most don't actually run a valve into the bore, at least at human lift levels.
...ed

 

the heads are cast iron vortec heads
i thought fastburn but have been told that they only made fastburn in aluminum
i found out part of my problem
the nitrous switch was on and
the tank off so it was shooting fuel
in the motor and flooding it
i switched this off and it helped a bit
but below 3300 rpm it is still like a slug
i turned the fuel pressure up to the max
50-52 and it idles better and feels
a little stronger. i know i need new injectors can you change the nozzles on the stock ones? also it runs and idles a little better when the knock sensor is disconnected.
the brakes dont let me torque it up past 2200 because of vaccum so this explains my slow starts. can the injector nozzles on stock injectors be chnged?
thanks kyle

 

I am suprised that nobody said anything or it's just my opinion but your converter is way too small for that cam and heads concotion. Espically with the weight of the car. That could be a problem. Your best bet would be to find a 350 to work with that combo.

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97 formula w/6speed,cags skipshift eleminator, hurst billet pro shifter, 30#injectors,adjustiable fuel presure regulator,Moroso cold air induction,ported mass air sensor,accell300+ ignition box, accell 9000 wires, bosch platnum4 plugs,flomaster crossflow muffler,Lingenfiter 52mm throttle body,TPIS L98 SuperProfile cam,Crane 1:6 full roller rockers,Edelbrock subframe connectors,Edelbrock strut tower brace.

Other car is a 89 GTA w/700r4w/stage 2 shift kit, corvette servo, B&M mega shifter, TPIS bigmouth intake, TPIS large tube runners, TPIS 52mm throttle body,LT1 24# injectors,GMPP LT4 hotcam,CompCams Pro magnum roller rockers, this car is currently under rebuild and restoration.