Fuel Pressure Maxed out
06-04-2019, 11:54 AM
#11
but ideally if your goal is 400 or higher its smart to go with the 1300s only because if you are getting there on 1000s it will be on the higher end of the injector range. also 1000cc injectors will also be limiting you on e85.
06-04-2019, 12:32 PM
#12
im only at 65% duty cycle iirc. ~400whp on e85. bosch 1300cc injectors. aem 400 in a surge tank and oem pump as a lifter pump stock feed and return line, stock rail and aem bolt on fpr at stock rail pressure. id say up the injector they are cheap enough
also what gauge wire are your running to your fuel pump? stock isnt going to cut it for a pump that size
also what gauge wire are your running to your fuel pump? stock isnt going to cut it for a pump that size
06-04-2019, 04:09 PM
#13
Fuel pump flow rate decreases significantly with increasing fuel pressure (assuming a centrifugal pump like the 450).
Injector flow rate increases with increasing fuel pressure.
Either could limit you. Do the math based on the pump and injector curves. A good example of this is a V8 with ID850's and a Walbro 450. The fuel pump is limiting even though a lot of people go with ID1050 or ID1300. You need a low base pressure (30-40 psi) to max out the injectors and pump simultaneously under boost.
Tim
Injector flow rate increases with increasing fuel pressure.
Either could limit you. Do the math based on the pump and injector curves. A good example of this is a V8 with ID850's and a Walbro 450. The fuel pump is limiting even though a lot of people go with ID1050 or ID1300. You need a low base pressure (30-40 psi) to max out the injectors and pump simultaneously under boost.
Tim
06-04-2019, 11:41 PM
#14
not by much, depending on displacement it is def doable on an ap2 but not sure on an ap1. i did 399 @ 75% as a stock 2.2 ... i did 451 @90% as a built 2.4... both with grams 1000cc... how much displacement has to do with it I cant really comment on. But its def possible, but not ideal. If I go about getting it retuned i'll probably switch to id1300's myself
but ideally if your goal is 400 or higher its smart to go with the 1300s only because if you are getting there on 1000s it will be on the higher end of the injector range. also 1000cc injectors will also be limiting you on e85.
but ideally if your goal is 400 or higher its smart to go with the 1300s only because if you are getting there on 1000s it will be on the higher end of the injector range. also 1000cc injectors will also be limiting you on e85.
06-05-2019, 03:58 AM
#15
If you haven’t installed the grams injectors yet I would recommend using something else. There have been some minor documented issues with them on hot starts and id1300 are cheap enough to consider. Remember if you decided you want to upgrade after your going to have to pay for another tune so the cost of the injectors now becomes a wash. I wish I did this ahead of time myself
06-05-2019, 04:36 AM
#16
If you haven’t installed the grams injectors yet I would recommend using something else. There have been some minor documented issues with them on hot starts and id1300 are cheap enough to consider. Remember if you decided you want to upgrade after your going to have to pay for another tune so the cost of the injectors now becomes a wash. I wish I did this ahead of time myself
06-05-2019, 12:46 PM
#17
Mostly hot start issues due to temp of fuel going into the engine. It doesn’t happen on all of them but evan @ Evan’s tuning told me about it and after doing some research verified it. I have not had the issue and apparently letting it sit will Get it to start again. On a returned fuel system the problem is less likely to occur and even on my non return it’s been fine but it’s still possible.
06-05-2019, 10:01 PM
#18
Mostly hot start issues due to temp of fuel going into the engine. It doesn’t happen on all of them but evan @ Evan’s tuning told me about it and after doing some research verified it. I have not had the issue and apparently letting it sit will Get it to start again. On a returned fuel system the problem is less likely to occur and even on my non return it’s been fine but it’s still possible.
BTW, LHT has put out many a supercharged S2000 making above 400whp on supplied Grams 1000cc injectors.
06-06-2019, 12:52 AM
#19
If you haven’t installed the grams injectors yet I would recommend using something else. There have been some minor documented issues with them on hot starts and id1300 are cheap enough to consider. Remember if you decided you want to upgrade after your going to have to pay for another tune so the cost of the injectors now becomes a wash. I wish I did this ahead of time myself
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RolanTHUNDER (06-06-2019)
06-06-2019, 02:49 AM
#20
ID1300s are $900.....Grams will more than satisfy his goals of 400whp. "Minor documented issues" occur from almost every manufacturer from time to time. If the Grams injectors were as much of a problem as their fuel pumps we'd assuredly know this by now. I don't think advising someone against something that has worked for plenty of others and will work for them and their goals and instead pointing them towards something that costs twice as much is good advice....Sorry. You seem to be making good power with your car, more than he wants to make, and you've said you've had your kit installed for a couple of years now with no issues. That being said I don't think you need to promote Grams, but at the same time given your success, I'm not seeing a reason to advise against them either.