Hi,
i've a problem.
for a couple of months my engine hits a wall at high rpm's
the engine is tuned and i think its around 300hp
before the months i have no wall.
i changed alot and always busy to make it better.
the chip is make by Brian(tbichips.com)
i play a little with the fuel pressure to get the wall away but it is hard.
at 17psi its running strong and the wall is at 5700rpm
at 19,5 psi a little rough and wass is 5200rpm
now at 16,5psi wall is 5400rpm
i don't mind that the power is gone but hitting a wall is not fine.
anyone a idea?

Tom

 

most likely it's your injecters going static.

Are you using the 305 injecters or 350 injecters?

Anyways you need a better tune than a mail order chip you need someone local who knows how to tune it as you datalog and play with it a little to make it just right.

 

hi,

my duty cycles are good.
i'm using 65pph copcar injectors.
i live in Holland(Europe) and no one over here does understand the tbi and defitanely not with the mods i have.

Tom

 

What is the combo of your motor? I would bet the farm that the chip you received is way off. Mail order tunes do not work. Fear not, with a little leg work and some reading you can burn your own chips and dial in the exact chip that your motor needs.

Free Tune

 

lot of mods actualy
1989 tbi but completely different.
here's a little list of the mods.
ENGINE:

New Rebuilt Balanced 350ci tbi,--
--
3.484" stroke nodular iron crank
• 5.7" forged rods with ARP rod bolts
• Pistons at 9.0 to 1 compression
More special features of this engine include:
• Hydraulic flat tappet cam with .448"Int/.472"Exh valve lift (1.6 rockers)
• 64cc heads with 1.940"Int/1.500"Exh valves and 1.250" high performance springs
• Double row timing set
• High volume oil pump with welded big pickup screen and steel drive shaft and steel guide
• 1-pc design molded rubber oil pan gasket with load limiters to prevent over-tightening and higher temperature resistance than standard cork-rubber gaskets
• Brass expansion plugs
Edelbrock Performer aluminum intake manifold


K&N 14''open element with breather,
Hypertech Powercharger,
Modified air-cleaner base to custom-fit the Powercharger,
Edelbrock performer 3704-intake-manifold,
LT1 cam 94'specs,
Cop-car injectors(65pph) @ 17psi.,
Jet fuel pressure regulator,
590 cfm high flow Tbi-unit,
Injector-spacer,
Walbro 255lph fuelpump,
Custom tuned ECM-chip by Tbichips.com,
Flowtech headers,.
True Dual 2,5 inch exhaust with Flowmaster 40 Delta flows,
MSD 8226 blaster coil,
MSD 8.5mm Superconductor cables,
Base timing 8* advanced,
Hypertech high-flow-180 thermostat.
Powertrax No-slip locker with 3.42 gears,
Red Koni-shocks,
140 amp.alternator,
Powermaster billet 9526 XS Torque Starter.

TRANSMISSION:


Th-700r4----.B&M kickdownkit,
Corvette servo,
.500boost valve,
Long-Tru-Transcooler,
Precision 2200rpm High stall converter
Stage 2 reprogrammed governor/Lt1-z28.


Soon:, ,.
Lakewood Traction Bars.2" Belltech Rear Shackle Lowering Kit.
Hurst – Roll Control-Linelock,Russell Speed Bleeders,Russell Street legal Braided Stainless Steel Brake line kit,

 

I found your problem. Your tun eis not custom unless you took the car to him and he had it in his hands to make live changes. Anything else is a one off stab in the dark chip.

 

i can't take the truck to him because i live in Europe
he's helping me so much but i know that is hard for him because i live so far away.
you say that i must learn the chipburning and so to get the most performance out of my engine?
my technical english is good but not perfect.
do you think that's possible to learn it myself.
if i can get the wall past the wot-shiftpoint i'm ready.

Tom

 

this week i'm going to log the truck again.
anyone interested to see the logs also?
i'm trying to get much data in the higher rpm's

how much play i can have on the distributor shaft?

Tom

 

hi,

last weekend i logged the truck.
the wall is still there
tbichips said that the airflow was not enought at that high rpm's
i changed indeed before the wall from a cold air intake to an open element
14 x 2 1/4''

when i change to the 14 x 4 and flow top its gonna be much better
sounds this good??

for the experts i have lying the log if you want to see it.

hope you can help me

Tom