|
Help with disappointing dyno results
I recently had the car tuned on a dyno prior to a blower but the dyno results were seriously disappointing. I can feel an improvement over stock but not ads much as I thought. It only made 250 rear wheel hp!!! :ack: The car starts hard (I expected this since we removed the 9th injector) and surges on cold start up but the surge goes away as it warms up. My mods are: Engine: 80000 km’s (aprox 50k miles) Stock bottom end AFR 180 eliminator heads Comp 268 xfi hr13 ( duration @50 218/224) High flow L98 base, ported SLP runners, ported plenum Adjustable fuel pressure regulator Exhaust: Long tube headers True dual exhaust Magnaflow mufflers Transmission: 700r4 2400 stall torque converter Shift kit Considering everything I’ve heard on the forums I think something is wrong. If anyone has any words of advice please chime in |
Originally Posted by fast.asleep
(Post 1597521611)
I recently had the car tuned on a dyno prior to a blower but the dyno results were seriously disappointing. I can feel an improvement over stock but not ads much as I thought. It only made 250 rear wheel hp!!! :ack: The car starts hard (I expected this since we removed the 9th injector) and surges on cold start up but the surge goes away as it warms up. My mods are: Engine: 80000 km’s (aprox 50k miles) Stock bottom end AFR 180 eliminator heads Comp 268 xfi hr13 ( duration @50 218/224) High flow L98 base, ported SLP runners, ported plenum Adjustable fuel pressure regulator Exhaust: Long tube headers True dual exhaust Magnaflow mufflers Transmission: 700r4 2400 stall torque converter Shift kit Considering everything I’ve heard on the forums I think something is wrong. If anyone has any words of advice please chime in You have a blower on top of all the other mods? The mods alone I would figure 300 whp. What does fuel pressure do when you are doing a dyno run? What size injectors do you have? This could be a tuning issue. Hard to tell. |
No blower yet I wanted a before and after comparison. After fixing a vacuum leak on the intake the car needed to be retuned. Not sure what the fuel pressure was on the dyno but when the key is on (engine off) it’s at 40psi. At idle fuel pressure goes to 50psi |
Originally Posted by fast.asleep
(Post 1597521792)
No blower yet I wanted a before and after comparison. After fixing a vacuum leak on the intake the car needed to be retuned. Not sure what the fuel pressure was on the dyno but when the key is on (engine off) it’s at 40psi. At idle fuel pressure goes to 50psi |
What fuel injectors do you have? I have similar mods, minus the heads, and am running Bosch 3 24lb hr injectors. I also began tuning and it makes a big difference. Just changing the injector size and full throttle power enrichment was noticeable.
|
Stock fuel injectors. |
Originally Posted by fast.asleep
(Post 1597522010)
Stock fuel injectors. |
Originally Posted by fast.asleep
(Post 1597521611)
I recently had the car tuned on a dyno prior to a blower but the dyno results were seriously disappointing. I can feel an improvement over stock but not ads much as I thought. It only made 250 rear wheel hp!!! :ack: The car starts hard (I expected this since we removed the 9th injector) and surges on cold start up but the surge goes away as it warms up. My mods are: Engine: 80000 km’s (aprox 50k miles) Stock bottom end AFR 180 eliminator heads Comp 268 xfi hr13 ( duration @50 218/224) High flow L98 base, ported SLP runners, ported plenum Adjustable fuel pressure regulator Exhaust: Long tube headers True dual exhaust Magnaflow mufflers Transmission: 700r4 2400 stall torque converter Shift kit Considering everything I’ve heard on the forums I think something is wrong. If anyone has any words of advice please chime in |
How low is the compression ratio?
How much torque and where is peak torque and hp? |
Compression? I want to say stock. As for peak hp and torque:
Originally Posted by bjankuski
(Post 1597522477)
Attach a dyno sheet.
|
It’s easy....you are running a choking intake system....that base and runner do nothing over the stock long runner set up...makes torque, not horsepower....mini ram will provide about 40 rwhp over that....with the same time tune....after a tune ....even better....ask me how I know!! surprised it’s not making more rwtrq though. |
elaborate on high flow base?
You need the right sized injectros and a good tune thats holding you back big time. Look up Wongs Performance in Vancouver |
..... 250 rear wheel hp is actually a nice improvement over stock rated 240 flywheel hp … small-ish heads , small cam , TPI and Long tubes got you 50-60hp over stock ! … nothing wrong with that ! …..
|
Is the chip custom tuned for this camshaft
|
Originally Posted by 856SPEED
(Post 1597523016)
It’s easy....you are running a choking intake system....that base and runner do nothing over the stock long runner set up...makes torque, not horsepower....mini ram will provide about 40 rwhp over that....with the same time tune....after a tune ....even better....ask me how I know!! surprised it’s not making more rwtrq though.
Originally Posted by vader86
(Post 1597523245)
Is the chip custom tuned for this camshaft
|
….. What size are the combustion chambers on those heads ? ….. And , what year is your car ? …..
|
Originally Posted by C409
(Post 1597523330)
….. What size are the combustion chambers on those heads ? …..
|
Originally Posted by cuisinartvette
(Post 1597523221)
elaborate on high flow base?
You need the right sized injectros and a good tune thats holding you back big time. Look up Wongs Performance in Vancouver What do you reccomend as far as injectors? I have to swap them out anyway when I move to a blower |
Originally Posted by C409
(Post 1597523231)
..... 250 rear wheel hp is actually a nice improvement over stock rated 240 flywheel hp … small-ish heads , small cam , TPI and Long tubes got you 50-60hp over stock ! … nothing wrong with that ! …..
|
Originally Posted by 383vett
(Post 1597523678)
:iagree: What timing are you running?
|
| All times are GMT -4. The time now is 01:20 PM. |
© 2024 MH Sub I, LLC dba Internet Brands