092eg6

85x95 15:1 cr
toda d cams
ERE ported GSR head
ssr side exit
walbro 255 intank
rc 770 inj.
b&m fpr
hondata s200
74tb


motor was runing good from ericksracing, made 293hp on his dynapack
motor sat for couple of months nothing done to it but went to a different chasis and now motor runs lean and not really making power. It made only 237whp on a local dyno jet and the AFR on WOT is at 14:5-14:7, we had to max out the b&m FPR to bring the AFR to 13:1...... this was only a base run on the local dynojet, no tuning was involve, because i was running the same chip/program when it was dyno tuned at Ericksracing.
what can i do to richen up the AFR a bit?

Teamdiesel

Try to add 3% of fuel across the board in the hi-cam map. Do you have a wideband?

Teamdiesel

This just goes to show that most dynopacks read quite generous lol.

Teamdiesel

Seems like about a 19% loss from the dynopack to the dynojet. Didn't think it would be that much loss .

092eg6

i got people telling me 15% and some telling me 22%

SergEK

The problem with dyno jet numbers are the variables -- how tight are the straps, how large are the wheels....slicks? Tire pressure? Tire compound on top of run variables like temp etc...

Dynapacks are better for tuning as they provide load for part throttle tuning --- dynojet is WOT rolling a drum --- shows a power "figure" but again - lots of variables to consider even run to run or dynojet to dynojet.

Teamdiesel

I get what you are saying, but aren't all those variables things that are taken into account when racing. I mean doesn't tire pressure affect 60fts, don't wheel and slick size affect gearing and mph, doesn't temp affect IAT's which could offset a tune? I am just throwing an opinion out there, correct me if I am wrong.

92TypeR

This is true for older DynoJet models, but the X series have variable load control, target RPM, and target Manifold Pressure.

OP - First, assess the health of the motor. Leakdown, compression test...etc

Have you performed a general tune up lately? Replace the cap and rotor, get new plugs.

You need a good re-tune. Set base timing again, mess with the fuel maps, and tune MBT.

mar778c

iTrader: (1)

This just indicates you little know. How a dyno indicates is mostly based on the operator.

You actually think you have a 19% loss by rolling on tires versus the hubs, lol. Where do you think that power is dissipated?

mar778c

iTrader: (1)

Some good advice.

Marshall

allmotorpackage

hmm .. when the motor moved into a different chassis , are the bolt-ons still the same ? .. have u verified that the fuel pump in the new chassis is as efficient as the old one ? .. checked for clogged injectors ? .. out of curiosity , u maxed out ur fpr to get ur afr to 13.1 .. what was it at previously ?

omniman

it varies from dyno to dyno. i took my car one time about 6 years ago and dynoed it on 3 different dynojets and none read the same. the numbers were 209,218,223

223 was the first one
209 was the second one
218 was the third one.

you have to compare at the same dyno if possible.

dynopacs vary also. and they have 2 different hp calculations depending on the age of the model. church uses the early calculation but there is another calculation that can be installed that provides #'s comparable to the dynojet.

if your not racing in some highly competitive race series where every last hp counts its nothing to loose sleep over.

092eg6

forgot to add that it was also missfiring at the lower end of the powerband.
I will have to chang the wires,cap, rotors, and maybe the fuel filter. I'll try and see if i can get the dyno chart in here so it would be a better understanding....

092eg6

Also will i loose power in this motor by switching from sunoco 116 to E85??
the price of sunoco 116 is killing me

mar778c

iTrader: (1)

Yes, you will need to re-tune.

lohatch

wow i thought this engine was making 290+

092eg6

yea at the hubs

Spent

I'll simply say this and take it for what it's worth..... We operate a Dynojet and our readings are usually within 3whp of another two local Dyno Dynamics. At the same time, there is another local Dynojet that reads 12-20% higher than ours.