this car still just doesnt wanna make great numbers
08-31-2020, 05:14 PM
#61
Your graph is in STD. I'm asking for him to convert it to SAE which is a click of the button. It'll tell you if it corrects higher or lower based on weather conditions. Either way you can use IPW to get to IDC to HP and tell if the Dyno is light or heavy. That top end does look a bit suspect though. I wish you could throw stock rockers on it lol.
08-31-2020, 05:37 PM
#62
Your graph is in STD. I'm asking for him to convert it to SAE which is a click of the button. It'll tell you if it corrects higher or lower based on weather conditions. Either way you can use IPW to get to IDC to HP and tell if the Dyno is light or heavy. That top end does look a bit suspect though. I wish you could throw stock rockers on it lol.
09-19-2020, 01:34 PM
#64
I would look at valvetrain #1 with this. Just reading what you wrote, that sticks out the most. I would verify the pushrod length absolutely and see what reality is. Yes, adj rockers can make up for some variance, but if geometry is way off then it'll do weird **** like what you are seeing. The rocker weight shouldn't be so far off, although they are heavier, but it's a TI valve so how heavy could the whole combo be? If all else fails, pull the cam and try another. Something may be off w/ that, something you are not seeing. For the amount of power you are off, w/ the basics checking out, that's what I would look at. Duty cycle of the injectors is super important also, first thing to check is if it's running out of fuel. You may be on the edge of the max of those inj, 42's seem a touch small for that combo. Good luck!
09-19-2020, 08:33 PM
#65
I would look at valvetrain #1 with this. Just reading what you wrote, that sticks out the most. I would verify the pushrod length absolutely and see what reality is. Yes, adj rockers can make up for some variance, but if geometry is way off then it'll do weird **** like what you are seeing. The rocker weight shouldn't be so far off, although they are heavier, but it's a TI valve so how heavy could the whole combo be? If all else fails, pull the cam and try another. Something may be off w/ that, something you are not seeing. For the amount of power you are off, w/ the basics checking out, that's what I would look at. Duty cycle of the injectors is super important also, first thing to check is if it's running out of fuel. You may be on the edge of the max of those inj, 42's seem a touch small for that combo. Good luck!
he set the rockers up so that the mini rocker tool they give you sits correctly. as long as the asjustment screw isnt a certain too many turns each way, and the rocker tool sits correctly geometry is correct.
just not sure how it can be a valvetrain issue.
09-19-2020, 09:03 PM
#66
TECH Resident
Im running YT adjustable and it was recommended i run minimum 185lb on the seat.. I wiped a few lifters and damaged the cam. Now im at 200lb on the seat So if the crowers are heavier and with the experience ive just had id go 215lb minimum on the seat... The open pressure wasnt a problem at 500-505lb.... Sounds like youve tried everything so far so mayb throw a new set of springs at it and see how it goes.....
09-19-2020, 10:05 PM
#67
Im running YT adjustable and it was recommended i run minimum 185lb on the seat.. I wiped a few lifters and damaged the cam. Now im at 200lb on the seat So if the crowers are heavier and with the experience ive just had id go 215lb minimum on the seat... The open pressure wasnt a problem at 500-505lb.... Sounds like youve tried everything so far so mayb throw a new set of springs at it and see how it goes.....
09-19-2020, 11:31 PM
#68
he said somethinh like the duty cycle matches the dyno curve, so at peak hp as it levels off, so does duty cycle. as graph goes down so does duty cycle. meaning fueling is doing is doing what it should. doesnt mean airflow is tho. an unstable valvetrain will cause airflow issues as well. the 97 kpa isnt dog **** but not great.
he set the rockers up so that the mini rocker tool they give you sits correctly. as long as the asjustment screw isnt a certain too many turns each way, and the rocker tool sits correctly geometry is correct.
just not sure how it can be a valvetrain issue.
he set the rockers up so that the mini rocker tool they give you sits correctly. as long as the asjustment screw isnt a certain too many turns each way, and the rocker tool sits correctly geometry is correct.
just not sure how it can be a valvetrain issue.
09-19-2020, 11:49 PM
#69
I see what you mean, but I would still re-measure and look at the whole valve train set-up. I don't think it's the springs, either, but maybe there is something. If the duty cycle is not maxxed out then inj are probably adequate. Next on the list is your coils. I have seen several others have similar problems to yours and it turned out to be coils are tired/old.
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DualQuadDave (09-22-2020)
09-20-2020, 01:20 PM
#71
TECH Fanatic
iTrader: (5)
I’m sure the engineers at Crower know what they’re doing. I’d say 8mm is fine, maybe not optimum You should consider SD tune if you haven’t done so already. Even if you only have 15 passes of seat time you can still go for the mph, which is very telling if you know your exact weight with driver. You might only be hurt by reaction time with lack of experience, not total trap speed, what’s so difficult about ringing it out for mph?
09-20-2020, 04:32 PM
#72
I’m sure the engineers at Crower know what they’re doing. I’d say 8mm is fine, maybe not optimum You should consider SD tune if you haven’t done so already. Even if you only have 15 passes of seat time you can still go for the mph, which is very telling if you know your exact weight with driver. You might only be hurt by reaction time with lack of experience, not total trap speed, what’s so difficult about ringing it out for mph?
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64post (09-20-2020)
09-20-2020, 10:43 PM
#73
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jmilz28 (04-12-2021)
11-01-2020, 09:33 PM
#77
wanted to stop back. got injured at work so on workers comp so goona use this time to get this car home within 3 weeks.....yes i know you guys arent holding your breath.....
ran the car with no maf screen on maf tune, removed the crower rockers and reinstalled the YT rockers with correct pushrod length. also left the springs on there set at 200 pounds installed reran it quick and saw no gains. he did tell me the tq numbers could be a touch low so since he hasnt really messed with the mid range tune to build tq. i plan on going down there when he dynos it next. problem is hes been down a tech for awhile which again put my problem on the back burner. so small bit of hope, a SD tune with some low end work might be worth 15 20 rwhp putting it in an acceptable range maybe? maybe my cam is a touch big to create the low end numbers? as far as fueling, until i get a smooth curve im goona rule out fueling since he says the fueling matches the air going in.....really think its a valvetrain issue somehow. i will definately get the tune for darth to look at tho.
one other thought, im wondering if the johnson lifters are holding the valves open somehow? i believe we are running driven 50W break in oil due to thats what the builder set the bearings for. maybe the johnsons dont like that? will be calling johnson up about that tomorrow.
ran the car with no maf screen on maf tune, removed the crower rockers and reinstalled the YT rockers with correct pushrod length. also left the springs on there set at 200 pounds installed reran it quick and saw no gains. he did tell me the tq numbers could be a touch low so since he hasnt really messed with the mid range tune to build tq. i plan on going down there when he dynos it next. problem is hes been down a tech for awhile which again put my problem on the back burner. so small bit of hope, a SD tune with some low end work might be worth 15 20 rwhp putting it in an acceptable range maybe? maybe my cam is a touch big to create the low end numbers? as far as fueling, until i get a smooth curve im goona rule out fueling since he says the fueling matches the air going in.....really think its a valvetrain issue somehow. i will definately get the tune for darth to look at tho.
one other thought, im wondering if the johnson lifters are holding the valves open somehow? i believe we are running driven 50W break in oil due to thats what the builder set the bearings for. maybe the johnsons dont like that? will be calling johnson up about that tomorrow.
11-01-2020, 09:53 PM
#78
TECH Senior Member
Man that is THICK OIL! While the rest of your engine may like/need it, I bet the lifters DON'T.
Just my .02....
Just my .02....
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G Atsma (11-01-2020)