Total rebuild, cranks but won't start
If i'm in the wrong spot then please redirect me as i'm new here and not all that bright. Alright, down to business. I have a 95 z28 that i have converted to a 383 stroker lt1, with (deep breath) all forged scat crank, 5.75" rods, 2 valve relief sl pistons, clevite bearings, trickflow cam 530/530 113 lsa (should have gone bigger), 185 cc trickflow 21° heads, ported intake, 58 mm throttle bbk tb, 44 lb injectors, 255 lph fuel pump, holley adjustable fuel regulator, bahnhoff stage 3 clutch, blah, blah, blah. I ordered a new tune from pcmforless. Problem i am having is that the car turns over but won't catch and fire. When I put in the old tune it will run but not idle. I need a little help!!! Car sounds amazing when it runs though.
|
Re: Total rebuild, cranks but won't start
If it starts with 44 #/Hr injectors on the "old tune" and the old tune was for significantly smaller injectors, may be a problem with low fuel pressure. What is the set pressure for the adjustable fuel pressure regulator? Have you checked the fuel pressure.
Cam specs appear to be incomplete. Appears tha 530/530 may in fact be 0.530"/0.530" lift. What is the duration at 0.050"? Have you scanned it for codes? |
Re: Total rebuild, cranks but won't start
Originally Posted by Injuneer
(Post 6980460)
If it starts with 44 #/Hr injectors on the "old tune" and the old tune was for significantly smaller injectors, may be a problem with low fuel pressure. What is the set pressure for the adjustable fuel pressure regulator? Have you checked the fuel pressure.
Cam specs appear to be incomplete. Appears tha 530/530 may in fact be 0.530"/0.530" lift. What is the duration at 0.050"? Have you scanned it for codes? |
Re: Total rebuild, cranks but won't start
Originally Posted by 95craz28
(Post 6980470)
fuel pressure regulator is set to 43.5 psi and with the new tune no codes are shown. I tried putting the stock injectors back in but got the same results.
|
Re: Total rebuild, cranks but won't start
Originally Posted by 95craz28
(Post 6980471)
at .50 it is 108/118 lift
Possibly you meant 208 I/218 E, which would be a small cam for a stock engine, let alone a 383. Stock 95 LT1 is 202 I/207 E. |
Re: Total rebuild, cranks but won't start
Appears you have this Trick Flow cam:
The specs-0.530/0.530-inch lift (with 1.6-ratio rockers), 219/227-degree duration, and a 113-degree lobe-separation angle |
Re: Total rebuild, cranks but won't start
Originally Posted by Injuneer
(Post 6980474)
Appears you have this Trick Flow cam:
|
Re: Total rebuild, cranks but won't start
After the rebuild, did it ever run correctly? Or has this problem existed since you first started up the 383?
That heads/cam kit is rated by Trick Flow at 430HP. They recommend 30 #/HR injectors, and that is consistent with my normal guideline, which is to multiply flywheel HP x 0.07 to get the minimum injector size (430 x 0.07 = 30.1 #/HR). The 44's would appear to be a bit of overkill, but if the PCM is tuned correctly for them, there is no downside. What brand injectors do you have, and are they high impedance (12 - 15 ohms)? Was pcmforless provided with accurate info? |
Re: Total rebuild, cranks but won't start
Originally Posted by Injuneer
(Post 6980482)
After the rebuild, did it ever run correctly? Or has this problem existed since you first started up the 383?
That heads/cam kit is rated by Trick Flow at 430HP. They recommend 30 #/HR injectors, and that is consistent with my normal guideline, which is to multiply flywheel HP x 0.07 to get the minimum injector size (430 x 0.07 = 30.1 #/HR). The 44's would appear to be a bit of overkill, but if the PCM is tuned correctly for them, there is no downside. What brand injectors do you have, and are they high impedance (12 - 15 ohms)? Was pcmforless provided with accurate info? |
Re: Total rebuild, cranks but won't start
And I wasn't suggesting there was anything wrong with the tune... just making sure they had the correct info.
|
Re: Total rebuild, cranks but won't start
Originally Posted by Injuneer
(Post 6980489)
And I wasn't suggesting there was anything wrong with the tune... just making sure they had the correct info.
|
Re: Total rebuild, cranks but won't start
What happens if you put your stock injectors and previous tune back in?
The Accel injectors had a bad rap many years ago.. not sure if they have improved. As long as the tune and the injectors match, going "too big" should not be a problem. |
All times are GMT -5. The time now is 03:27 AM. |
© 2024 MH Sub I, LLC dba Internet Brands