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It's now happening consistently at 6200. Doesn't matter the drive mode, or stability/ traction control on or off. Same Feels like you lift off the throttle from wot to 80% throttle to redline. Becoming more pronounced No DTC codes

2025 GT. Manual Trans. Bone stock. approx 1900 miles. Feels normal at WOT from at stop accelerating in 1st gear until somewhere between 6500 & 6800 (didn't log it) when it feels like the throttle was lifted slightly for 200rpms ish then it pulls hard again until redline. Still...

under 2000 miles ... wot 1st & 2nd gear, clean clear 75F day... hesitation around 6200rpms. Getting slightly worse over the last week. This in "sport mode". Any ideas? Haven't done any data logging... I mean.. come on... it's a new car. Bone stock.

R compound tires. Do your research. Stay away from used slicks. While they sound tempting, you'll be chasing your setup because the next set of used slicks (even if the same make/model) will perform differently. That's why we never setup race cars on used slicks. Too inconsistent. And...

Has anyone put a pressure sensor in the stock s650 GT intake, between the grill and airbox (with lids on)... On a Dyno? I see this conversation get completely takeoff on a tangent to air intake temperatures.... but zero about if the grill is actually restriction considering it's mostly...

Let me rephrase the question (sorry). The question is: Are there any back-to-back dyno runs... showing a before-and-after comparison, of a stock S650 GT with and without the airbox covers on (hood open). That's all I'm asking. Thx.

All, I've seen this issue "sort of" addressed..... but I haven't seen any straight up back-to-back dyno runs of a S650 GT on dyno... stock... with airbox lids on, and airbox lids off (basically simulating an open GT grill non-restricted grill). Are there any? Thanks.

Done a lot of racing myself. But I have to say... that video with the chase car cam was probably one of the coolest track videos I've seen. And the driving looks great too (although there's no way I'd do that with at least a super light carbon helmet even with no Hans). Nice work!

So what was the lap time? What tires, and how much weight was removed?

A pressure sensor will accurately tell you if the "mostly blocked off" grill is restricting air flow to the air boxes. I've wondered the same thing myself. Obviously Ford opened up the grill on some models. There is for sure at least one big reason why, or Ford wouldn't have done it. All I...

You should dyno with hood closed so that the air has to be drawn in through the factory restricted regular GT grill.

It would be no different that running the car on a dyno with the hood open and the air box covers removed. So if the ECU can compensate in that scenario, then there is no issue.

If you don't see any obvious oil leaks... do a leak down test. That will tell you a lot.

Will you ship to Ca?

So what was the lap time?

If you are in California, you will see gas stations that have "E85". Yellow handle pump. That's what the gas stations call it. Go blame them. And... my gauge measures the ethanol content real-time. Yes it's not 85% ethanol. I get it. But that is what's being sold which is called "E85"...

These are race cars not street cars. I was only pointing out the power difference between the 2 fuel types. Nobody runs pump e85 in expensive race engines because the amt of ethenol varies too much.... Hence the 110 leaded race fuel (at the race track).

Also... as another data point: Dynoed the LS7 race car on race fuel 110 leaded, then E85 pump (which was about 78%-79% ethanol. Only made 5RWHP difference at 650RWHP. Not worth it (even if the pump E85 was consistent)

The sweet spot is fuel that will let you run all the ignition timing you need without detonation. I haven't played with these cars tuning wise (nor am I going to) but if that engine can run all the ignition timing it needs with 50-60% ethanol great (not too surprising considering it's a NA...